I saw this website on the Ohio board and thought some people here might be interested. It reminds me of the old ESPN Passport, but I think I like this a little bit better. I signed up and thought it was pretty cool, especially for a free site.
bbpassport.com let's you know exactly how many games you've attended, arenas you've seen, and what your favorite teams' records are when you're there. They have games as far back as 1980. You can also create a bucket list of arenas you want to visit, accept various challenges, and plan a road trip.
http://www.bbpassport.com/