I really like the design. You have worked it well. The about this site page is nice, in my opinion it’s a bit long. I might try and break the plug-ins list down into 2-3 side by side columns the same way you did at the bottom with your recent posts/tracks/fav links.
Also, I am sure you already know this but the Now Playing link for plug ins hasn’t yet been linked. Lastly your description for “Paged blog posts” and “Custom blocks on a page” are the same.
Everything else looks great. Well done.