Nice enough, looks clean, only suggestion would be to get the category tree on submission page sorted out as when you have more categories its going to to take a month to find your choice.
clean & simple.... unique touch on the top categories on the right but, no offense, not too sure about the big star as a logo though....
I'm on a 20inch widescreen and the header, navigation, categories image and footer are completely broken. FF and IE. (1600 x 1200 resolution)