This Tshirt from ThinkGeek, detects Wi-Fi signals and intimates you by lighting up the bars on the front decal. The bars dynamically glow on and off, depending on the Wi-Fi signal strength. It detects both 802.11b & 802.11g signals and runs off three AAA Batteries.
The folks at ThinkGeek assure us that "geeky chicks" will actually dig this stuff, and allow you to connect to their ‘Hot Spots’….Not.
You can order this ‘kitty magnet’ on their site for $29.99, but be prepared to join a long waiting list.