I've heard that SuSE has pretty good wireless support, but if it won't work, try ndiswrapper, available at
http://ndiswrapper.sourceforge.net
As long as you have the kernel source installed, the installation is fairly simple--just read the INSTALL file. Ndiswrapper works with most broadcom chipsets, as far as I know. I have a WPC54G working with ndis.
Also, check out the wireless networking forums here--there's a ton of info on ndiswrapper.