Awesome leaderboard implementations

[cmo]

Since OpenFeint has more or less died (thanks, Gree) it seems like most people are using Game Center for their basic leader boards / social features.

One thing I've noticed is that most Game Center implementations just use Apple's vanilla overlay, which I hate -- it completely covers the game with a window that has entirely different design, takes time to load, etc. This is true even though Apple appears to support custom views that fit the game (http://developer.apple.com/library/i...derBoards.html, in the section: Adding Leaderboard Support to Your Game > Retrieving Score Data)

So my question is: what are everyone's favorite custom implementations of Game Center (or leader boards in general)? One of the few that I've seen, which is also pretty good, is Clash of Clans (attached a screenshot if anyone is interested).