i've recently gotten wireless working with debian on an iBook, and it also required the b43 drivers. in debian you'd have to add contrib to your /etc/apt/sources.list and then apt-get install the b43-fwcutter package i think? i've been dealing with broadcom a lot lately, and have been trying to find an easy way to just store the driver on a flash drive and then install it in the proper place. however i don't know where that would be (/lib/firmware?) and which drivers exactly are needed.