Um, I hate to break the news to you, but you have exactly one choice for this card and it is the bcm43xx project
. That wireless card uses a Broadcom chipset, and Broadcom refuses to support Linux in any way, shape or form. Those of us on Intel boxen can use ndiswrapper and a Windows driver, but that won't work on a G3.
If you decide to try this driver, you absolutely positively MUST be running a 2.6.15 kernel. At this point in time that means patching the 2.6.14 source code (actually easy to do) and compiling your own kernel. The other thing is that as far as I can tell, the bcm43xx driver currently doesn't support WEP or WPA encryption (well, at least I haven't been able to get it to work).
If you want to switch to a different card, I'd suggest spending some time on the LQ HCL and Googling a lot to find one that works with a Mac and has native Linux support.