I see both sides to the argument. Craigslist is acting in their own self interest as PadMapper was by using CL's data to add value to their service.

While unfortunate, the move by Craiglist isn't surprising. They have done this repeatedly. The situation PadMapper is in is inevitable for any entity that isn't self-sustaining..

PadMapper should be working as quickly as possible to capitalize on the added attention this has caused and start letting users input their listings directly..