Could Craigslist be ramping up for a re-design?
http://www.craigslist.org/about/craigslist_is_hiring
I hope so, it's been a long time coming. They've been hiring for a while now, and I've noticed they have been pushing a lot of new changes in the last 6-12months to production. I will have to check out the site more often, I haven't noticed anything :/