1. The yellow "we're in beta" alertbar. The alertbar usually tells you that the website is trying to do something fishy you don't want it to, like popups.
2. The inconsistent menubar. On the front page, if I just want to check out your site without signing up, there isn't one. When I click "Browse MinuteBox" a menubar shows up, but it disappears when I click "Profile" and forces me to hit the back button instead of going to another page.
On another note, I know you're beta and everything, but I see no requests. Which means I can't really check out what that (the most important) side of your site is about. I don't know what you could do about it besides making fake requests, but I can't really see what your site is about at the moment.