An official stats page.
I don't think it would work, because there are a lot of cheaters out there. This will only bring out more of them. I like keeping a tally of mine, just for my sake, but if there was a leader board, you would eventually get some clown that would actually want you to believe he could find 30 or 40 caches a weekend, every weekend, for a year. Not that it couldn't be done but, it would be hard to believe; unless he didn't have a real job, or life to go with it.