I got my WiFi Finder today, its pretty big for a keychain, but then again, I carry a PocketPC Phone so I'm used to large tech gadgets. The WiFi Finder succesfully noticed that my office has a wireless network, and from reading the instructions, it can detect both 802.11b and 802.11g networks. I'll keep reporting on how well war-walking works, and I'll probably get some chalk too :)
Goldfarb sent out this nice tip for how you can tell Windows whether you want to use your wireless or LAN connection for a network: