How about Augmented Reality for Signal Strength?

Immaterials: Light painting WiFi from Timo on Vimeo.

This awesome video by Timo Arnall, Jørn Knutsen and Einar Sneve Martinussen whose project--Immaterials: Light painting WiFi that displays WiFi signal though long exposure photographs and light painting--got me thinking, wouldn't this be the most useful augmented reality app ever? How great would it be to see the network around you, so you could figure out where to stand to get an actual internet connection, or make a phone call?

Or maybe I'm just sensitive because I'm still on the AT&T network.