I'm using a Broadcom 54g AirForceOne chipset right now...native (not ndiswrapper) in Ubuntu Feisty 7.04. The card is PCMCIA. There's a guide at Ubuntu Forums. I'm using PCMCIA, but my friend's laptop has the same chipset built in and it works on his too.
I will let you know if it's natively supported when I finally install 7.10 (maybe beta, maybe final) on my laptop.