Here's the official Google ebookstore video:
http://www.youtube.com/watch?v=ZKEaypYJbb4

Check out the official site here:
http://books.google.com/ebooks

This is going to be *perfect* with the Galaxy Tab. I am looking forward to trying it out!

Amazon has another very serious contender.

EDIT: On second thought, they seem to be missing quite a few recent titles. My first two searches came up blank! It looks like Amazon is still sitting in a good position!

Anyway, competition is good, no?