The Wi-Fi locator firm Skyhook, which relies on public and private Wi-Fi beacons to provide a GPS-like service, has deal with AOL: A free downloadable plug-in for AOL Instant Messenger (AIM) adds a buddy list grouping labeled Near Me, which shows buddies in physical proximity; they can be plotted on a map, even. Skyhook's database now contains 16m access points in the US and Canada. They use 200 trucks to troll 2,500 cities.