I am also look for the io80211 kext file. As well, ass the AppleAirportBRCM kext. I'm running a mac and I'm trying to figure out how to get my USB broadcom adapter to work. I know some of you are gonna say that it's not supported or whatever, but I'm still gonna try. I searched my HD (on my Mac) and I can't find these files. Do I need to look on my Tiger install DVD?