My friends and I had a startup idea in 2007 that competed with Craigslist. (I didn't follow through, but one of them is still in that space) I can't believe that five years later, no one has managed to push CL off the top. It was a bad user in 2007 and still bad now. Everyone I know tolerates CL. No one likes it. CL refuses to add new features that would improve the user experience and benefit customers.
I love the UI on Craigslist. With the exception of housing, none of it would be improved by adding AJAX cruft. I also love that I've been able to sell and buy hundreds of items, and have never created an account and never given them much in the way of personally identifiable information.
