Glenn Fleishman got a hold of the Chrysalis WiFi Seeker, a keychain-sized sniffer to detect 802.11b/g networks and says it’s the best yet:
Push the button on the WiFi Seeker and it scans briefly, often under a second, before displaying a signal strength in zero to four LEDs. Keep the button held down and it s a Wi-Fi dowser, allowing you to move around and see immediate response to different signal strengths.
