If you want a good card at a reasonable price, about 40 USD on sale, the Netgear WG511 (802.11g) is supported with the prism54 driver. Couple of caveats, if you are not using Klaus Knopper's awesome Knoppix 3.3 it takes some mucking about copying the windows .arm file over and placing it in the firmware.agent directory, compiling the prism54 module, and etc. Also, the WG511T is not supported it is not the Prism GT chipset, so be careful when you buy. If this sounds like agony, use Mark's excellent suggestion or go to http://www.linux-wlan.com/linux-wlan/ and check their compatibility list.
Carl Boyette
