I got a Buffalo WLI-PCM-11 to work with netstumbler using the latest Orinoco drivers and client software from
http://www.orinocowireless.com/template.html?section=m52&envelope=90&page=2944

There seems to be some problem with the control panel application (it errors when it tries to load) but apart from that it works fine, both for normal lan use and netstumbling, as long as you run the card diagnostics in the orinoco client software first.

The package comes with drivers for 3 cards, I used the PC Card 5v ones, in a dell latitude lm laptop.

Hope this helps