AutoTempest is way better than allofcraigs, which is basically the exact same thing as typing "vehicross site:craigslist.org" into the standard Google search engine (see the logo that says "Google Custom Search"?). Google crawls the internet to build it's search index, and since it's impossible to accomplish that in real time, the results are often "stale." Case in point, if you start clicking on the Craigslist links in allofcraigs you'll find that a high percentage of them are dead links.

AutoTempest is a bit more clunky since it opens a frame for each CL site within your search radius, but the advantage is you're seeing LIVE results because you're querying directly against each CL site's database. Another bonus is that you can enable picture previews so you don't have to click each of the links.