Hey Steve - like the site. I have zero time, or I'd offer to help... but just as a quick SEM/
SEO note, I think you might do better with Flash than that big hunk of JS code making your slideshow, and fleshing out the home page with a large paragraph of densely-written copy will help rankings. I almost think you could hack out the slideshow in any language, tighten the login/search, perhaps side by side, and then you'd have a lot of room to really pour out some
SEO-conscious text.
Might also consider placing links to all or more themes on that top bar where you list a dozen or so... that would free-up some space for a bit of copy in lower-right if you do choose to keep the slideshow, and it helps get you a few more hits to have the themes as links at the top, or I should think it would.
Best of luck to you.