I run 64-bit on some boxes.  Java is no problem, the only thing I have trouble with is Flash.  All of the Free drivers in the kernel are fully ported to x86_64.
The vast majority (around 95%) of the debian repositories are ported to x86_64 as well.  I use Ubuntu for the most part, and it works quite well.

About the only thing, besides Flash, that doesn't work is the occasional game.
Of course, none of the malware works, which makes it fun to use a 64-bit-only machine to browse the web, if you accidentally encounter malware, it usually provides pretty effects as it blows up ;-)

==Joseph++

gm5729 wrote:
> Hey all. Guys and gals :)
> 
> I am wondering if any of you run a 64 bit environment on your
> machines? I just purchased a Lenovo laptop dual core and am doing
> research before I figure out what route I want to go with it. My
> concern is that there will not be enough programs to support the 64
> bit environment along with drivers. Mainly I need printing through
> CUPS. I know Java and Flash cause problems right now and are only
> available 32 bit. I could do a chroot-jail to do 32 bit stuff but I
> don't know if I want to go through the hassle. I run Debian Lenny on
> my boxes. Comments? Advice?
> 
> Gregory
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