What's In A Number?

The shock of seeing Josh Reddick wearing Mike Greenwell's #39 in tonight's Sox game reminded me of this fantastic site that lists the Red Sox all-time uniform numbers. It's arranged by number, so you can see every player in Red Sox history that has ever worn #1, #2, #3, etc. I have no idea if this exists for any other teams in any other sports...but if it does, please post.