1) Logo could be clearer, I don’t know if it is but.. It looks slightly pixelated.
2) Buttons also… hmm, they seem like you’ve made it in Artisteer or something, take some time to make them better.
3) Footer padding, why is the text not in the middle of the footer?
I don’t like the gradient too much, make it a bit softer, less obvious that there is one. Furthermore, the borders on the menu items, try to make insets with CSS by doing a border-right, border-left with 1px solid #fff and a darker colour.
Also, the site lacks symmetry; the borders need to be perfectly aligned with the content (main content).
That’s about it; the gradient is the biggest turn off and ironically the most recurrent thing we did when we were new at designing; it’s the point of making the gradients hard. Mix those colors right and you shall see.