Craigslist isn't suing PadMapper for adding maps, it's suing because it sues everyone who republishes CL data (with the exception of generic search engines). CL's real target is 3Taps, which is where PM gets its data. If CL loses the lawsuit, the most valuable piece for developers remaining will be CL images. 3Taps' API includes links to those images, as well as much other useful data, but CL is never going to let developers hotlink to the pictures it hosts. (One could launder those image links through a 3rd party service, but the scope is too large to be undetectable, besides it introduces an ethical issue.) The larger play here, which may in time overtake CL itself, is 3Taps' plan to open the classifieds space in a big way.