Video courtesy of Micello
Micello (pronounced “my-sell-o”) calls there product Google Maps for inside buildings. It provides information about objects (stores for example) inside of large indoor locations like shopping centers, convention centers, or airport.
Micello lets anyone, so they say, build indoor maps.
You can see it demoed on an iPhone (actually several are used during their demo) in the embedded video above. It looks like a great idea. I hope it catches on. I sure could have used it myself in a bunch of airports and convention centers over the years.