Intro to Android (and the $10M) by Google's Brin

Told you it's serious.  Here's a video in which Google co-founder Sergey Brin introduces Android.  The introduction is followed by demos of multiple applications on two prototype phones:

Last but not least, at the end of the video Brin talks again and announces the $10,000,000 developer prize.

Also, if you're interested in the architecture of the software, you may want to watch this three part video:

• Android, Part 1: Architecture Overview
  
• Android, Part 2: Application Life Cycle
  
• Android, Part 3: APIs (specially pay attention to the Location Manager and Location Based Notification)

Last but not least, here's the Android Documentation.  Updates can be found on the Android Developers Blog.