Insofar as I can tell all it does is strip me of basic functionality (e.g., save the thing so I can read it offline), introduce confusing functionality (TWO scrollbars on the left!? WTF?) and all for what? So some engineers could do some flash-based masturbation & feel web 2.0?
Scribd.com developers: you are not Web 2.0. You are not 1.0. You are web -0.5. You are what we people did when they had bullshit internal doc apps, before HTML.
Now please stop pissing off the Internet & go under already.