Slashdot | Canary Wireless Digital Hotspotter Reviewed over on Slashdot.
I got one too and have tried it within the office environment. It’s very useful but not as portable as my key chain WiFi detector, but it’s much better as it gives information about the SSID and if the Hotspot is WEP’d or not ! Buy one if you use WiFi and need to find a location that’s open.