Yet another Wi-Fi detector enters the fray: The Zyxel AG-225H Wi-Fi Finder puts all its discovered information in a single LCD screen, which is far superior than the scrolling option in the Canary Wireless Digital Hotspotter (see review). I haven't tested the Zyxel unit, but it detects 802.11a, b, and g networks, including MIMO and beamforming signals, and is a USB 2.0 802.11a/b/g Wi-Fi adapter. It's just $99.