Every year, prospective NFL players take the Wonderlic Personnel Test, which tests problem solving ability and is considered a decent measure of overall intelligence.
Try out a mini-version here. I got 7 out of 9 correct, which correlates to a 39. Same as Brian Griese, and more than double Dan Marino.
Here's a blog post which lists many players' reported scores. Tom did better than Peyton, but Eil beat them both. And Vince Young? Ouch.
In other news, a 4-year old gets ABSOLUTELY DRILLED by a wide receiver during a game in Colorado. He's okay, so you don't have to feel too guilty if you laugh at the video. Um, allowing little kids to roam around on the field during football games? Maybe not such a good idea.