I love craigslist as an apartment finding tool. Most of the ads for apartments include a google maps link, so I can figure out if it's really in the area I'm interested in.

But every time I move I wish constantly for a service that would let me search craigslist by actual location. My mental picture is a location and distance, but some kind of region-selection on a google-maps overlay would be even better.. or a location and a maximum travel time. A feed of those ads as they are made would be even more powerful.