Is it possible to have a time based leaderboards instead of a score based one in Game Center and Openfeint with the shortest time placed first? And how many leaderboards can a game/app have? What is the best way to do leaderboards if you have multiple levels?

You can have a lot of leaderboards, I think last I checked it was 50 but you can check that yourself on the OpenFeint site. (I'm unsure on GC but that you can also find out from Apple.)

You can have a time based leaderboard, you'd just choose to display it from lowest to highest instead of the normal high to low. (There's a check box for that, very simple.)

For multiple levels, I have seen a lot of people do one per "world" or "group" of levels, supposing they are spaced out that way - but at the end of the day it comes down to opinion.

Peach :)

Thanks!