I've put out an idea I've liked for a while:LeaderboardHQ.com
LeaderboardHQ makes it easy (and free) to create a leaderboard online from any device. Both admin and public links can be shared to allow viewing and contributions by anyone you share it with.
It's a fun idea with a very simple implementation at the moment. I can think of a ton of ways to create some fun features around it. I have seen a lot of leaderboards out there recently, so I think there is a good market for it.
Creating some methods of automation will be a good way create some awareness/traction, so I will be thinking of ways to do that.