Are there more 30 day blog challenges somewhere?

Someone turned me on to the 30 Day Letter Challenge. I don’t actually have a blog (those of you who have added me on facebook can see that I’m just posting my letters as notes there.), but I am having so much fun with it. I’m only on day 9, but I catch myself dreading when the 30 days is up.

Are there more challenges like this out there somewhere? If not… do you have any suggestions of your own?