I would change the body text to white and perhaps a sans-serif font. The frame surrounding it looks really polished, but the text looks kind of bland. Play it up with stylesheets. Also, I think it'd look great if you used stylesheets to change the color of the scrollbar to match the rest of the site.
If you want to have flash to spice up your site, you might want to do something with the top. I'd leave the bottom static (or, perhaps just do the flash stuff once, or when people mouseover it), but I could definitely see having some subtle movement through the squares on top.
Also, I think it'd be nice if you put different pictures in the lefthand column for each of the different sections. Or, do a JavaScript dealy that randomly puts an image there.
All-in-all, though, I think it's a really great looking site. Love the green; it goes well with what the site's about.
Hope this is helpful...
Misty