Why do you want my email password? I'm using gmail, so I assume you could use OAuth for that? Also the request permissions dialog for FB is just plain scary, do you really need all those permissions? I like the sleek interface!

edit: if I view a tweet with replies, I would like to click the tweets bellow that to see replies to that tweet (just like on twitter.com)

edit2: add google reader integration for news feeds

edit3: how about visually separating content from different sources? For instance I put more importance to stuff from FB and if posts from FB would have a blue background (just an example) I could find them more easily in the swarm of twitter posts ...