I've mentioned this in a few threads recently because it's something that I'd love to see many many more games work with.
SpaceChem's leaderboards.
Presenting them as a bell curve rather than a straight ranking is a *much* better way of handling leaderboards. While it's nice if you're good enough to fight for a top-ten ranking in a conventional leaderboard (say...), the average player doesn't really get any such enjoyment out of the global leaderboards, only really competition against friends. SpaceChem's bell curve, though, allows you to see if your performance is
above-average; not something leaderboards built around straight rankings can really do, and it gives *any* player something realistic to strive for; being left of the curve *always* feels achievable, and it's rewarding when you get there.