Well, I think it's a really good start. The logo is really good. The colors I like for this type of site. However, as GuiltyGear suggested, the bevel and emboss of the left nav buttons could be improved. And the design thing at the bottom should be removed (designed for ie and ff). You shouldn't have to tell users what browser the site works well with, you should should be able to design the site for whatever browser.
Suggestions:
- Make the logo smaller, it's a bit overpowering
- Make the footer linear rather than vertical
- For the green area around the main content, use a soft line gradient (don't know what to call it)
- remove the bevel curves around the left hand buttons. Try to come up with something better
Overall, it looks good. Some tweaks here and there and I think it will look really good.