I think the site looks great except for the 2 top menus on the left. There is too much red text there and it is distracting, but perhaps if you switched off between red and black like you did on the rest of the site it would work. For example: Arts, Graphics, Design <--in red 3D Graphics, 3D Modeling <--in black Good luck with your site.
I would align the header and the content table together and make them the same size (when you make the screen wider, they both become different sizes)