Randall's and anyweb's instructions work for me (Fedora 7, 2.6.22-1-41.fc7, new Dell Latitude D520 with the BCM4311/BCM2050 chipset)... BUT it is painfully slow... worse than dial-up.
I saw some rumors elsewhere that there are problems prior to 2.6.22rc4 (http://lists.berlios.de/pipermail/bcm43xx-dev/2007-June/004859.html).
Any thoughts? Sounds like I'm not the only one with speed problems.