Seamless WiFi Roaming

This WiFi roaming technology from Stefan Savage and Ishwar Ramani at UC San Diego is nifty. Called SyncScan, it proactively monitors all nearby wireless access points so that when the signal from your current one wanes you quickly leap to an adjacent one with better signal strength.
While 450ms to 1s lag in cut-over without SyncScan might not seem like much, it is like having your data hit by a truck if you’re using timing-sensitive apps like Skype. SyncScan takes the cut-over time down to an average of 5ms, which is virtually imperceptible.
[Update] There is some sound critical comment on the SyncScan approach here.