In my dream last night, Google Maps had a new layer - when you were zoomed in, you would see tiny fluttering icons for Twitter, Facebook, and other social software sites, moving in a cloud just above the 2D map surface. Each icon represented a real-time public post to those networks. If you clicked on one, you coud read it. If you didn't want to read any of them, you could brush them away like fruit flies - and they'd scatter for a few moments, and then like fruit flies they'd return.
If I knew more about working with APIs, I could probably build something like this. Not sure it would be useful, but in the dream it was pretty to play with.