Jonas Hielscher has developed an interactive PSP game called “CollecTic”, which basically “has you running around outside trying to collect WLAN access points with your portable”. Video after the jump.
Each point is given a distinct color, geometric shape and sound based on its particular MAC address. The size of the point is determined by how strong the signal is. The object of the game is to fill your three-by-three grid with shapes, finishing with three in a row