nice site, loads fast
1. personally I don't like gradient on the headers (you can help, advice a column), maybe try to make it in one color with nice border or something like that.
2. try to make main body background #888888, now you have white on the main bg and white is bg of your site, not good...
3. you have lots of text without background, why it's in graphic? crop it into html and make this as a html text. That way it will be more anti-aliased and you'll get some points from SE later.
4. mouse over on main menu
5. maybe add a simple flash movie with promo of your product at the right corner of your site
good luck with your site
