"So you've got the latest WiFi-capable smartphone and a Nintendo DS Lite with you, and you're itching for some gaming session with a little email on the side. How are you going to find the nearest WiFi hotspot in order to get going? That task is made simple with this $18.95 pen that comes with a built-in WiFi finder." - UberGizmo
Implications - If you're searching for WiFi and you don't have a smartphone or laptop, then the WiFi detector pen is what you need.
This nifty little gadget will help you search for the hotspots as you stroll through the streets praying that you'll be able to send your e-mail soon. Simply push the button on the barrel and detect signals within a 50 foot radius. The strength of the signal is displayed with green, red and yellow LEDs.