I like it!
Disclaimer: You probably shouldn't be taking aesthetic advice from me... Take a look at this site after all.
I've never been much for the flat "W3C compliant" look, but you've made that look about as good as it gets. And besides, what the hell do I know? (see disclaimer)
It also has an interesting premise that links those "four areas" together nicely. And, I really like how you've worked that premise into your post here in this forum too...
It is not too busy.
It is very nice. I like the premise a lot. The little bit of PG-13 rated material makes me a bit paranoid about having links to it here. But that's not necessarily a bad thing.
There needs to be a new word for the paranoia that is caused in webmasters because of vague, unwritten Google rules. That's probably a perfect topic for your site.