These are map files compatible with Google Maps / Google Earth, generally scanned with the wifi and GPS in my phone. It is interesting to see just how much information is out there, radiating all around us. Many of the SSID names are amusing as well, and often provide a hint about the personalities of their owners.
The files linked here contain no packet data, but easily could in many cases. Those who complain about Google's "invasion of privacy" should be aware that when they broadcast their traffic, anyone can listen.