ISO Wars: Sony A550 vs Nikon D90 vs Canon T1i vs Olympus E620

Noise can be such a brute, which is perhaps why the french word for noise is "bruit" :) Focus Numerique has just published an ISO crop comparison between the Sony Alpha A550, the Nikon D90, the Canon D-Rebel 500D/T1i (which by the way you can get in a two-lens kit for $784), and the Olympus E620.

The crops are shown on the main page, however, each image in the comparison is available as a full-size download so you can analyze it on your own using your own pixel-peep-evaluation software and techniques.