They don't like allowing different kinds of searches or mashups. Some examples are searches that show included images beside each entry & a preview of the actua

They don't like allowing different kinds of searches or mashups. Some examples are searches that show included images beside each entry & a preview of the actual text, or searches that search further than just one region, or searches like housingmaps.com, which craigslist seem pretty ambivalent about. They want to stay in their own format and not let people take that format and transform into something that's possibly better.