Being mostly HTML and not images, the site loads quickly...
I would perhaps align the navigation more to the left. The white space to the left of the links is a little awkward.
I don't know if you are going for a grayscale look, but perhaps experiment with adding more color? I feel all the greys and whites wash out the site. Maybe a different background color?
Some of your thumbnails are a little stretched. If you are using Photoshop when scaling them, just make sure the check box for maintaining proportions is checked.
I feel like your site should also scale vertically. An example of this would be on the "Vote" and "Search" pages. Since there is not much content, the center white box should only take up as much space as the navigation on the left and the stats graphic.
Hope some of the comments helped.