I have been trying everything i could think of to get NS to recognize my card (Linksys WPC54GS) with no luck, {updates, upgrades, restart, remove-start-re Install card, you name it, I've tried it.
then:
I
unInstalled the Card "Software" and Drivers (linkshit) rebooted and Inserted the card and
Only installed the Drivers Manually (Device Manager).
Guess What, IT WORKS perfectly.
Not only does the Linksys software interfere with the NetStumbler but it also has a lower signal from my network and it likes to call home constantly (linksys.webgod.com)
Sys
Toshiba A25-S208
Internal 802.11b (agere chip) works fine with NS, [justreal slow]
Realtech 8139-nic
Intel P4 2.66 Ghz, 1Gig mem, 100Gig HDD
Teac 224 DVD/CD-rw combo
And soon to be

"WG-KIT03 Deluxe NetStumbler Kit "

and a "BUFFALO AirStation WLI-CB-G54S"

card. just ordered this weekend.