Simple little HTML/JavaScript page which allows you to make a leaderboard for Stack Overflow.
You will need to know the numeric user ids of some of your friends. I'll use Spolsky (uid:4), Jeff Atwood (uid:1) and Jon Skeet (uid:22656). I'll add us two as well: Neil (uid:13678) and Matthew (uid:268619).
Then we can create a URL like:
http://neilprosser.github.com/so-leaderboard/index.html?ids=1,4,22656,13678,268619