Not exactly something to impress the girls, but the Wi-Fi Detector shirt from ThinkGeek sure will show you're switched on. You'll certainly never have to get out your laptop to see if there's a wireless network about - simply look at your chest. Hey, it'll even show you the signal strength! "The glowing bars on the front of the shirt dynamically change as the surrounding Wi-fi signal strength fluctuates," says the blurb. It's yours for a mere $30...