Does a post a day every day for a month sound like a challenge - or a vacation? Depends on how prolific you are, I guess. In any case, how about spending November as a participant in National Blog Posting Month (NaBloPoMo)? I'm going to do it! I post something most days anyway - this just makes it official, and means I don't get to skip the weekends. Once you sign up, you can also join groups with other like-minded bloggers. There's still time to get in on the action!
As I understand it, daily posting is the only requirement - the content of those posts can be anything you like.
Thanks to Madame Meow for the heads-up and the invite to join her "Randombloggers" group - really, where else would I end up? (The 3rd "R" and all that, you know...)