Not strictly TT, but I had a look at the NW200 website and what a difference from the official TT site.
The TT one is fairly boring, doesn't seem to have changed it's look for years, and it has very little info on it. The northwest one is full of stuff about the place and the races and the riders. http://www.nw200.org
Time the TT was pushing the Isle of Man and the local business the way this one does for the northwest area, and lots of pictures and updates on what's happening.
Only poor thing, no forums, but that might be because of the abuse factor.