BZ raised, and although I know RT8187B support is EXPERIMENTAL, lots of people seem to be having quite a bit of success... just not me.
NetworkManager can establish the connection, but can't pass any traffic.
I've tried 2.6.28-1 and 2.6.27.9-159 kernels to no avail.
(note, the BZ is a clone, I started adding my info to a bug I thought was the same, turns out it's not, so I've cloned the orig and modified to better suite my issues)
https://bugzilla.redhat.com/show_bug.cgi?id=479860