Nice site! A couple of things I would suggest:
1) The main logo is quite compressed; since it is the first thing that visitors will see and is what they will identify you with, perhaps it could be redone so that it looks cleaner.
2) The constant navigation on the side is good. I think the links on the bottom of the page which point to more products should somehow be incorporated into the side links. Usually, the only info at the bottom of a page is stuff like site map, contact info, etc.
3) The side navigation should be made more separate from the main content, perhaps by using a border or different color scheme for that section.
I'll try to think of more!