Listpic: Browse Craigslist photos
Clicking on an image brings up a small window containing most of the information from the original listing, but with just one image. If you click permalink button you'll see the full add, including any additional photos. And if you click the title of your selected listing, you'll be redirected to the original Craigslist post.
Overall, it makes Craigslist just a little more useful when you're searching for something like an apartment, where looks matter.
[via Parent Hacks]