Catfood Follower has been failing with a (401) Unauthorized error message since Thursday night.
Twitter has suspended API access for follower because they object to a blog post on how to use it. I’m working with Twitter to try and understand their concern and hopefully Follower will be authorized again soon. I’ll update this post as soon as I have more news.
(Updated 2010-11-18 17:00 PST: Follower is working again. Let me know if you run into any problems.)