We're not announcing this widely, of course, and if you're interested in checking it out, we're certainly looking for feedback. We'll be adding a lot of functionality down the road that isn't really there yet, but for the very short term we're mostly trying to get what we do have stable and robust. So, check it out, and feel free to sign up and play around:
For a few ideas of what to do, here's a map I'm working on (for what I'm trying to do, there's a discussion. The map is best viewed -- of course -- in hybrid mode for the pretty satellite imagery). Or check out my lame profile -- feel free to friend me if you join up, of course.