T-shirt detects Wi-Fi

Here's a great gift for people who are too lazy to pop open their laptops or use a test instrument to find a Wi-Fi hotspot.

This "radioactive" black T-shirt uses three AAA batteries in a pocket to power a glowing decal display resembling a radio tower. Animated bars fluctuate with 802.11b or 802.11g signal strength. The animated display panel is removable (with Velcro-type fasteners) for washing. Cost is $29, from ThinkGeek.