Sign up here:
https://games.si.cnn.com/signup/signup.asp?game_id=50
After you've registered, click on "Find League" under the League Info tab at the top of the page. League name is: Letsrun.com (no password required)
You get double points in the first 4 rounds for picking an upset which is interesting. I went with CNNSi because the "leagues" could have more than 100 people and we'll have more than that. Plus you can win a million for picking everything perfectly.
If i'm feeling generous we may add some prizes later.