wifitop improvements from my train ride on Tuesday. New and improved: it actually accepts user input, it creates friendly names for things based on OUI and SSID beacons, it bolds the rows that have shown activity (other than beacons) in the last second, and you can expand/collapse the list of attached stations using keyboard navigation.
The most important thing I learned? Someone around here has a Blackberry on the guest network! Maybe Obama is in town. He's getting pretty lousy MCS levels though, so I'm guessing his phone got stuck and failed to roam to a nearer AP.