Description of problem: According to firmware choosing guide ( http://linuxwireless.org/en/users/Drivers/b43 ) users with recent kernel need recent version of broadcom's blob, namely broadcom-wl-4.150.10.5.tar.bz2 . But version of b43-fwcutter shipped with Fedra doesn't recognises firmware among binaries of the package above. Updating to 010 helps.
One more karma point and it will be pushed to stable ;) https://admin.fedoraproject.org/updates/F8/FEDORA-2008-0954