Notably section 3, "CONTENT," and the 2nd paragraph of section 14, "PROPRIETARY RIGHTS," in which they explicitly disclaim ownership: "Although craigslist does not claim ownership of content that its users post..."
now if only we could go get everyone who posted listings to sign off on allowing us access their data we could build an API in no time.
Then CL could just offer a bare-bones, REST, read-only firehose API to access those posts. Just like how Twitter does it. This entire project would probably take the developers at CL a month to roll out into prod. Hell, knowing how software shops work, they probably already have 3 private internal versions of it that were shelved by the ignorant, risk-averse management who only fear change and don't know how to tread water in the meandering river of technology and Internet society.
Wild idea for the Techcrunch rumor mill in 2011: it's too bad Twitter doesn't buy or merge with CL, and in absorbing CL, make them be more open and community-centric.
Perhaps CL will see the light and open up an API, as the newspapers get more desperate and turn up the dial on the hate. CL is going to need to show off something, anything to take the spot light off themselves before the wolves rush in now that they're injured & bleeding.
Look, Craigslist doesn't want an api.
Its their software and its that simple
People need to get over it or ... you know ... go build their own classifieds listing service or something.