I love game used memorabilia, and gameuseduniverse.com is by far the most interesting place to go read about that aspect of the hobby. Since most of the collectors on this site are so knowledgable, there are some great threads to read about their experiences with forgeries as well as their favorites from their collection.
My favorite thread on the site can be found here, a 75 page mammoth of people showing off their NFL gear. With the recent advent of NFL auctions, this thread has had a few doozies added since I last checked.
If you are looking to kill an hour, check it out. You can thank me later.