Hi,
Founder of SearchTempest here. This came up in my Google Alerts, so I just wanted to stop in in case I could help, or answer any questions.
Thanks to those of you who recommended the site - glad you like it! There were some changes made a few months back, in response to a change at Google, which was our primary source for results. Basically there are now two ways to use the site. The standard way is with what we call "Direct Results". Basically what it does is link you straight to craigslist results pages, but it automates the process of going to each separate area, checking a bunch of boxes, typing in your keywords (or pasting them) over and over, etc. You just enter the search once on SearchTempest, put in your zip and how far you want to search, and we automatically generate links to craiglist results pages covering your entire search area. Each one covers multiple cities, so you can cover a whole state in only one or two links, and the whole country in about twenty. (There's also an 'open all' button to save time.) And unlike other sites that are still powered by Google, it doesn't miss anything, because it literally links you straight to craigslist.
Now, we do have an alternate mode, which we call "Single List Results". Instead of linking out to craigslist results pages, this still does rely on Google. Because of that, it will still miss stuff. (Those of you who mentioned missing results - maybe you were using this option?) We do have warnings on the site to mention that results can be missed if using Single List, but they might be missed. (Oh, and we agree that our layout needs an update - we're working hard on it!)
Anyway, hopefully that explains everything. I strongly recommend if you're going to use searchtempest.com to use the Direct Results view, unless you're just looking for a quick overview of what's out there. I'll subscribe to this thread in case anyone has questions for me. (Although one of us will also be happy to answer any emails you send through our contact page:
http://www.searchtempest.com/contact.)
Cheers,
Nathan