I've got a couple of challenges going right now.
1. The first is Pile on the Miles (POTM). The idea here is to pile on the miles (running or walking) instead of the pounds this November as holiday season gets started. There's a group spreadsheet to be updated before Friday each week, and there are weekly prizes. That's enough to keep me motivated to run (as if Vegas wasn't enough).
2. The second is the Holiday Bootie Buster Challenge (HBBC). This one covers all the holidays, running from November 19 to January 6. It's based on points for the activities you do, as well as points for eating fruits/veggies, responding on Facebook or completing challenges. I'm all for a good challenge!
3. My very own 1100K in 2011! I'm almost there! I need to think of a reward for myself :)