This certainly makes more sense than the WiFi detecting glow-in-the-dark t-shirts we've been seeing around. The Soyntec WiFinder
(not to confuse with a bag that finds Nintendo game consoles) has a little LCD display on the side to show you hotspot activity. Now you don't have to boot your laptop to search for open hotspots but you can simply check your laptop bag. If the signal is strong enough you can choose to boot your laptop and get online. Prices are between $52,- and $101,- for different models.