Update: Everything seems to be up and running now.
A little ahead of schedule, the first beta version of MIT's App Inventor for Android landed on the web today at appinventor.mit.edu. The App Inventor, first launched by Google in mid-2010 before being discontinued and open-sourced last year, allows just about anyone to dive directly into Android app development with a simple web-based interface. To get started with the public beta, all you need is a Google Account and a little creativity.
However the launch seems to have been a little bumpy -- earlier this morning the site was working just fine, but now MIT's servers seem to be having trouble dealing with the influx of traffic. Hopefully it'll be back up before too long -- we'll update this post whenever there are any further signs of life from MIT's site.
More: MIT App Inventor; Thanks to everyone who sent this in!