Snapsort compares major features like the max ISO setting, weight, speed of continuous shooting, megapixels, sensor type, and more. The information is grouped into category by similarity and difference so you can quickly see what is identical—or nearly so—and what is different enough to merit a closer look.
Both cameras are assigned points based on the features they sport and a winner is selected. Both the winner and loser have a detailed score sheet you can examine to see if you agree with the ranking or if a certain feature or benefit gives the loser an edge. Snapsort tracks which cameras are commonly compared so you can select additional cameras that you may be considering purchasing.
Here’s an example comparing Nikon’s D300S to Nikon’s D90. While I’d do more homework when comparing cameras, Snapsort seems like a good place to start.