This is a widget available as a Yahoo Widget or Vista Sidebar gadget, and it is a nice militaristic looking radar screen. With your settings, it scans for wifi networks. Interestingly enough, it plots the physical location of nearby access points. Very cool. It also gives you statistical data about the point. Its pretty much eyecandy, along with the ease of choosing access points to connect to on an actual physical plot.
Check it out: Xirrus.