Great blog. Narrow your categories down to a lot less than what you have. Move your sidebar to the right.
Interesting blog, but personally I don't like the design. You should get a banner up instead of just text. Also you have to many categories, try to narrow it down to at most ten. And like "ninjamtlt1 said, move your sidebar to the right.
As almost everybody said above, you should make some categories with more than 1 post in it. By now, if I am right, every post has it's own category. In the same time reduce the number of popular post to let's say five, in order to shorten the list.