Have you thought over if you want to build it into a system with any community aspects? I'm working on something that has very similar base level functions.
I'd like to hear more about what you're working on.
Less words on front page might help. I was curious about how you were going to have a different style of conversation, but after looking around for a bit, it seems like, as you said, a tumblelog and friend feed.
As an aside, I liked the parens in the menus, as it gives it a different look.