A couple pieces of advice from what I can see.
1) Don't go with a red logo and a blue page. Pure Red (255, 0, 0) clashes too much with most blues.
2) For your nav bar, differentiate between the selected category image and the mouse-over image. The difference can be as simple as the small colored bar on the right of the category image. It just simply doesn't feel right to have the same style.
3) Maybe change the login button to an image for aesthetics? Not really a big deal, just something that'd be nice. You could also do the same for the poll.
4) Like other said, for detailed images, make sure they can be viewed in a larger manner whether in a pop-up when clicked, a hover-over enlarge javascript bubble thing or a link to the image in the same window.
Oh and is this powered by Mambo? It really looks and acts like it .