couple of months ago i bought a linksys wusb54gc and when i changed from pc to mac i knew my built in wireless did not work so i went on the net and search most of the mac forums and came across a guy whos wireless had gone in his mac book and was a costly repair so instead he got a wusb54gc and used a piece of software called ralink and it worked hay presto wireless back i will be posting the software on a file server later on today if you have any questions feel free to ask

http://forum.insanelymac.com/index.php?showtopic=72412

Also look at my rigs on my Sig.

I bought a Belkin F5D9050 wireless card that works in Leopard perfect last night. Prior to that, I was using my Verizon Wireless aircard.

Downloading at 600kb/s sure as hell beats downloading at 60kb/s.

worked for me sometimes.. other times it doesnt not sure if my install is messed up or what, to lazy to fix seeing as a reboot makes it all better

This one works fine in Leopard. (Drivers are on the product website)
http://www.dlink.com/products/?pid=477

$29.99 at Staples (in Toronto)