buncha things...

add a dnsbl.cf in your /etc/mail/spamassassin directory

paste the following (which may or may not be updated, but hit's alot):

----------------------snip-----------------------------
#dnsbl.cf - Place this file in /etc/mail/spamassassin/dnsbl.cf
#Note that files are loaded in alphabetical order, any entries in local.cf
#will override the entries in this configuration file.
# EASYNET_NL is the Easynet.nl List: http://blackholes.easynet.nl .
header RCVD_IN_EASY             rbleval:check_rbl('relay', 'blackholes.easynet.nl.')
describe RCVD_IN_EASY           Received via EASYed relay
tflags RCVD_IN_EASY             net

# use *.blackholes.us DNSBL's
# $Id: blackholes.cf,v 1.2 2002/08/07 06:23:58 pancrace Exp $
header RCVD_IN_ARGENTINA        eval:check_rbl('country', 'argentina.blackholes.us.')
describe RCVD_IN_ARGENTINA      Received from Argentina
header RCVD_IN_BRAZIL           eval:check_rbl('country', 'brazil.blackholes.us.')
describe RCVD_IN_BRAZIL         Received from Brazil
header RCVD_IN_CHINA            eval:check_rbl('country', 'china.blackholes.us.')
describe RCVD_IN_CHINA          Received from China
header RCVD_IN_JAPAN            eval:check_rbl('country', 'japan.blackholes.us.')
describe RCVD_IN_JAPAN          Received from Japan
header RCVD_IN_KOREA            eval:check_rbl('country', 'korea.blackholes.us.')
describe RCVD_IN_KOREA          Received from Korea
header RCVD_IN_NIGERIA          eval:check_rbl('country', 'nigeria.blackholes.us.')
describe RCVD_IN_NIGERIA        Received from Nigeria
header RCVD_IN_RUSSIA           eval:check_rbl('country', 'russia.blackholes.us.')
describe RCVD_IN_RUSSIA         Received from Russia
header RCVD_IN_SINGAPORE        eval:check_rbl('country', 'singapore.blackholes.us.')
describe RCVD_IN_SINGAPORE      Received from Singapore
header RCVD_IN_TAIWAN           eval:check_rbl('country', 'taiwan.blackholes.us.')
describe RCVD_IN_TAIWAN         Received from Taiwan
header RCVD_IN_THAILAND         eval:check_rbl('country', 'thailand.blackholes.us.')
describe RCVD_IN_THAILAND       Received from Thailand

score RCVD_IN_ARGENTINA         3.0
score RCVD_IN_BRAZIL            3.0
score RCVD_IN_CHINA             3.0
score RCVD_IN_JAPAN             3.0
score RCVD_IN_KOREA             3.0
score RCVD_IN_NIGERIA           3.0
score RCVD_IN_RUSSIA            3.0
score RCVD_IN_SINGAPORE         3.0
score RCVD_IN_TAIWAN            3.0
score RCVD_IN_THAILAND          3.0

header RCVD_IN_BROADWING        eval:check_rbl('isp', 'broadwing.blackholes.us.')
describe RCVD_IN_BROADWING      Received from Broadwing network space
header RCVD_IN_CIBERLYNX        eval:check_rbl('isp', 'ciberlynx.blackholes.us.')
describe RCVD_IN_CIBERLYNX      Received from Ciberlynx network space
header RCVD_IN_CW               eval:check_rbl('isp', 'cw.blackholes.us.')
describe RCVD_IN_CW             Received from Cable and Wireless network space
header RCVD_IN_ELI              eval:check_rbl('isp', 'eli.blackholes.us.')
describe RCVD_IN_ELI            Received from ELI network space
header RCVD_IN_EPOCH            eval:check_rbl('isp', 'epoch.blackholes.us.')
describe RCVD_IN_EPOCH          Received from Epoch network space
header RCVD_IN_HE               eval:check_rbl('isp', 'he.blackholes.us.')
describe RCVD_IN_HE             Received from Hurricane Electric network space
header RCVD_IN_INFLOW           eval:check_rbl('isp', 'inflow.blackholes.us.')
describe RCVD_IN_INFLOW         Received from Inflow network space
header RCVD_IN_INTERNAP         eval:check_rbl('isp', 'internap.blackholes.us.')
describe RCVD_IN_INTERNAP       Received from Internap network space
header RCVD_IN_LEVEL3           eval:check_rbl('isp', 'level3.blackholes.us.')
describe RCVD_IN_LEVEL3         Received from Level 3 network space
header RCVD_IN_RACKSPACE        eval:check_rbl('isp', 'rackspace.blackholes.us.')
describe RCVD_IN_RACKSPACE      Received from Rackspace network space
header RCVD_IN_RR               eval:check_rbl('isp', 'rr.blackholes.us.')
describe RCVD_IN_RR             Received from Road Runner network space
header RCVD_IN_SKYNETWEB        eval:check_rbl('isp', 'skynetweb.blackholes.us.')
describe RCVD_IN_SKYNETWEB      Received from SkynetWeb network space
header RCVD_IN_VALUEWEB         eval:check_rbl('isp', 'valueweb.blackholes.us.')
describe RCVD_IN_VALUEWEB       Received from Valueweb/Cybergate network space
header RCVD_IN_VERIO            eval:check_rbl('isp', 'verio.blackholes.us.')
describe RCVD_IN_VERIO          Received from Verio network space
#header RCVD_IN_WANADOOFR        eval:check_rbl('isp', 'wanadoo-fr.blackholes.us.')
#describe RCVD_IN_WANADOOFR      Received from Wanadoo.fr network space
header RCVD_IN_XO               eval:check_rbl('isp', 'xo.blackholes.us.')
describe RCVD_IN_XO             Received from XO/Concentric network space
header RCVD_IN_SORBS            eval:check_rbl('isp', 'dnsbl.sorbs.net.')
describe RCVD_IN_SORBS          Received from IP in dnsbl.sorbs.net
header RCVD_IN_SPEWS            eval:check_rbl('isp', 'l1.spews.dnsbl.sorbs.net.')
describe RCVD_IN_SPEWS          Received from IP in Spews.sorbs.net
header RCVD_IN_ROGERS           eval:check_rbl('isp', 'rogers.blackholes.us.')
describe RCVD_IN_ROGERS         Received from rogers network space

score RCVD_IN_BROADWING         0.5
score RCVD_IN_CIBERLYNX         0.5
score RCVD_IN_CW                0.5
score RCVD_IN_ELI               0.5
score RCVD_IN_EPOCH             0.5
score RCVD_IN_HE                0.5
score RCVD_IN_INFLOW            0.5
score RCVD_IN_INTERNAP          0.5
score RCVD_IN_LEVEL3            0.5
score RCVD_IN_RACKSPACE         0.5
score RCVD_IN_RR                0.5
score RCVD_IN_SKYNETWEB         0.5
score RCVD_IN_VALUEWEB          0.5
score RCVD_IN_VERIO             0.5
#score RCVD_IN_WANADOOFR         0.5
score RCVD_IN_XO                0.5
score RCVD_IN_SORBS             0.5
score RCVD_IN_ROGERS            0.5
score RCVD_IN_CBL               0.5
score RCVD_IN_SBL               0.5
score RCVD_IN_BL_SPAMCOP_NET    1.5
score RCVD_IN_EASY              2.0
score RCVD_IN_SPEWS             2.0
score RCVD_IN_DSBL              2.0

#Single Zone BL's first

#CBL.ABUSEAT.ORG is a DNSBL of senders who have sent to spamtrap addresses.
#This one is pretty good at hitting crap spammers not caught by some others,
#especially clueless cable modem spammers.

header RCVD_IN_CBL              rbleval:check_rbl('relay', 'cbl.abuseat.org')
describe RCVD_IN_CBL            DNSBL: sender has sent spam to spamtraps
tflags RCVD_IN_CBL              net

# Multizone / Multi meaning BLs next

# SORBS, like MAPS RBL+ is a multi-meaning BL, so it is treated separately
header RCVD_IN_SORBS    rbleval:check_rbl('sorbs', 'dnsbl.sorbs.net.')
describe RCVD_IN_SORBS  Received via a relay in dnsbl.sorbs.net
tflags RCVD_IN_SORBS            net

# X prefix was used to insure that it was run at the end, but it's not needed
# anymore since we run the rule with rblreseval -- Marc
header X_SORBS_OPEN_HTTP        rbleval:check_rbl_results_for('sorbs', '127.0.0.2')
describe X_SORBS_OPEN_HTTP      DNSBL: sender is Confirmed Open Proxy
tflags X_SORBS_OPEN_HTTP        net

header X_SORBS_SOCKS            rbleval:check_rbl_results_for('sorbs', '127.0.0.3')
describe X_SORBS_SOCKS  DNSBL: send ip addy Confirmed Open Socks Proxy
tflags X_SORBS_SOCKS            net

header X_SORBS_MISC             rbleval:check_rbl_results_for('sorbs', '127.0.0.4')
describe X_SORBS_MISC           DNSBL: sender is Confirmed Open Misc Proxy
tflags X_SORBS_MISC             net

header X_SORBS_SMTP             rbleval:check_rbl_results_for('sorbs', '127.0.0.5')
describe X_SORBS_SMTP           DNSBL: sender is a Confirmed Open Relay
tflags X_SORBS_SMTP             net

header X_SORBS_SPAM             rbleval:check_rbl_results_for('sorbs', '127.0.0.6')
describe X_SORBS_SPAM           DNSBL: sender is a Confirmed spam Source
tflags X_SORBS_SPAM                     net

header X_SORBS_WEB              rbleval:check_rbl_results_for('sorbs', '127.0.0.7')
describe X_SORBS_WEB            DNSBL: sender is Confirmed Spam Support Web Server
tflags X_SORBS_WEB                      net

header X_SORBS_ZOMBIE           rbleval:check_rbl_results_for('sorbs', '127.0.0.9')
describe X_SORBS_ZOMBIE         DNSBL: sender is a Zombie Domain
tflags X_SORBS_ZOMBIE                   net

header X_SORBS_NOMAIL           rbleval:check_rbl_results_for('sorbs', '127.0.0.12')
describe X_SORBS_NOMAIL         DNSBL: sender is a Confirmed No Mail Ever zone
tflags X_SORBS_NOMAIL                   net
---------------------------snip--------------------------------

this in your local.cf, note some are probably not necessary to you, such as language, are your other rbls in place, and install dcc and razor that you can see noted

-------------------------snip----------------------------
lock_method flock
use_bayes 1
use_pyzor 0
#auto_learn 1
#rewrite_subject 1
required_hits 5.0
ok_languages en es
#report_safe 1
ok_locales en
rbl_timeout 5
razor_config /var/spool/filter/.razor/razor-agent.conf
use_razor2 1
razor_timeout 5
#dns_available no
bayes_auto_learn_threshold_spam 6.00
dcc_home /var/dcc

############################################################################

score NO_REAL_NAME              1.1
score USER_IN_WHITELIST -15.000
score DRUGS_ERECTILE 3.160 1.100 3.372 1.493
score DRUGS_ERECTILE_OBFU 2.833 3.046 2.816 3.408
---------------snip--------------------------

check your init.pre for

------------snip--------------------
# URIDNSBL - look up URLs found in the message against several DNS
# blocklists.
#
loadplugin Mail::SpamAssassin::Plugin::URIDNSBL

# Hashcash - perform hashcash verification.
#
loadplugin Mail::SpamAssassin::Plugin::Hashcash

# SPF - perform SPF verification.
#
loadplugin Mail::SpamAssassin::Plugin::SPF

#loadplugin Mail::SpamAssassin::Plugin::Razor2
------------snip------------------

just a few things, i've tweaked so much over time, it's too much to put in an email but this should get you started.  I cannot stress teaching via sa-learn, installing DCC and Razor2

Regards,
tickticker

Nathan England wrote: 
Anyone have any good spamassassin tricks while I'm on the topic?
I have mine set to change the header of anything over a 4.0 but it is very 
rare that anything is given over a 4.0. Even spam will only get a few points 
over a 4.0

What are people doing to get a 20.0 as some tutorials say to set it at?

--
Transforming Intelligent Construct Keen on Thorough Infiltration, Ceaseless Killing and Efficient Repair