This is very exciting! The Amazon Flexible Payments Service has finally launched!
I say finally, because I had the honor to be a small part of the development of this service when I moved to Bangalore. Amazon FPS was built almost entirely out of India by a really awesome team.
I left that team in February 2006, so I can't claim that much of my code lives on (which may be a good thing!) but I'm definitely proud to have played a part.
Awesome job guys!
update: here's the aws blog post.