The site is definitely loaded, maybe even a bit overloaded. Great features that had me playing with it for a while and kept the site very interesting which offset the "overloaded" factor.
I've seen this script somewhere before, if you could jumpstart my mind and PM me where you found the script or what it's name is, i'd really appreciate that!
i can't really add anything that's not already been said, except, due to the nature of how the site is built, your branding falls a bit short. If you have the opportunity to place a banner between the "register" and nav bar, you'd have some branding space.
Great start, like the content, miss the branding of your name and idea.