This is one of the resources I looked into when getting the WiFi working on my laptop.  This procedure uses NDISWrapper, something I do not want to do, so I skipped over it.
The problem I have is that the kernel (GPL) driver has problems with transmit power due to how the BCM4318 works.  The NDISWrapper simply wraps the Windows driver, so it tends to work in more cases, including this one, at the cost of using non-free software.  Since WiFi is relatively low priority for me, I chose to wait for the kernel driver to be fixed, rather than run a non-free driver under NDISWrapper.

There are still some connection reliability issues when using NDISWrapper, mostly due to the chip being very low power, but it works most of the time (as I mentioned in my earlier post).

==Joseph++

Mike Schwartz wrote:
> I found something that looks interesting, on the web at
>   http://ubuntuforums.org/showthread.php?t=197102
> Here is a quote from part of the "comments" thread there:
>> << "*Re: HOWTO: Broadcom 4318 Wireless Cards*
>> ------------------------------
>> Thanks so much for the help! I was slightly discouraged when my wireless
>> stopped working after I upgraded Breezy to Dapper, but it's working
>> perfectly now. " >>
> 
> However, I still am confused, and unable to determine whether the stuff
> that
> is offered at this site
> (I can download it via another computer, "before" I get my wifi working on
> my BCM4318).
> 
> Any advice appreciated.
> For example, can you tell whether the problem they are solving, is
> the same one mentioned [see below] on 10/3/06 by Joseph Sinclair?
> 
> Any other advice also appreciated.
> "such as", whether this site [see above] is [maybe] what I need.
> Thanks in advance,
> 

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