Do you mean that in a "he's clearly just promoting S3" or a "woah, the CTO of Amazon has time to code neat tools" kind of way?
S3 are kind of his "servers" no ;)
The extension and plugin mechanisms will make it easier for me to start adding my own code without having to modify the core framework. But it is always more fun to add these kind of things if there is a community to give you feedback.