The above mentioned Atheros cards work, but you will need the livna repository for the driver (madwifi).
Intel cards 2100, 2200, 2945, and the 3945 work with a default install of fedora. Fedora has included the firmware and the driver is in the kernel. Fedora uses the opensource driver for the 3945, which for me, works better than the closed source ipw3945. However, others have reported the ipw3945 working better. The ipw3945 is available from atrpms.
I'm sure there are many other older cards that work. Look through the lists at tuxmobile, or perhaps someone else may chime in with a card that works.