The only things that jumped out at me are:
1) I only see ads for stuff in dollars (maybe I didn't look around enough), but knowing what UK customs can slap on to the cost of buying something from the US, a lot of people in the UK probably won't even click them. I know you'll get US visitors, but I'd probably try to add more stuff with prices in pounds as well.
Ignore that if you have and I just didn't see them.
2) I see you ask people to join you at various places such as FaceBook & Bebo, etc., and given the theme of your site, you will no doubt attract a lot of youngsters.
It's your choice, obviously, but if the site were mine, I'd probably add something to that box, such as:
If you are under 16, please speak to a parent or guardian and read all guidelines with that parent or guardian before registering at any of these websites.
Or something like that.
The reason I say that is because my daughter is only allowed networking sites which can use a webcam, and if there isn't a webcam, she doesn't speak to them. So while I would be more than happy for her to bookmark your website, I wouldn't want her to have FaceBook. And I know quite a few parents who adopt that same rule, who would thank you for asking their child to speak to them.
I know some would register anyway if they have full internet access, and it's not your responsibility if they do, but if they love your site and respect you, they may take that request onboard.
Just a suggestion, though.
Other than that, it looks like a very useful site for people who like breaking their ankles and rupturing themselves on railings!