Sometimes you have to root for people who just do something because it presents a challenge - and not as a quick way to make a buck. That's the case with Carsabi founder Dwight Crow.
Carsabi, at its most basic, is an enhanced way to search through craigslist used car listings without having to open up specific geographic areas. For example, you could, as I did, look for hypothetically a 2005 Saab 93 within 100 miles. There's no easy way to do that on craigslist that I know of.
I did an email interview about Carsabi and was most intrigued by the fact that Dwight kicked off this venture simply for the challenge. He said of him and his partner (his housemate Chris), "We're both nerds so its fun to build things like this."
As of now, Carsabi is just a venture with no money coming in. At some point it might target Google advertising as a means of revenue. Right now, it's a nice clean site with no ads, which means you have nothing to lose by checking it out. No spam awaits you.