Got this from Geeksugar this morning, super handy.
When you do a Craigslist search, there's a new RSS link at the bottom. Click on it and you get a half-screen of garbage. Just copy the first link. Then you can add it as a feed to your RSS aggregator.
That's an obnoxious sentence. All it means is, it'll automatically update you to any posts matching your search. Which is nice.