http://www.netbooktracker.com
Basically a niche buyers guide. The code's abstracted, so it can easily be used to power different verticals. People seem to be enjoying it so far, the average visitor goes through 7 pages in a visit. It's still a bit confusing to use at the moment, so I'm hoping for some good advice here.
Browse through the site and when you see a model you're interested in, hit compare. It creates what amounts to a shopping cart of models you're interested in. When you have more than two selected, the comparison page does its magic. This is still a bit confusion, so if anyone has ideas I'm all ears.