Probably not that interesting to most people, but Yahoo Search doesn’t seem to have craigslist in its index:
Google does, of course. This matters to me because I use Yahoo Search’s API to collect statistics for http://www.langpop.com, and one of my sources is craigslist. I let craigslist know about the problem, and hopefully it will be fixed soon, so I can collect the stats for June!
Looks like it’s being indexed again, but still isn’t back to where it once was, so it’ll probably be a few days until I update langpop again.