By using a cheap Ikea lamp, a turntable, and random things they found around their house, ESReality turned unscientific reviews of gaming mice into something benchmarkable. Taking 22 different mice and graphing out their performance in terms of response, movement speed, DPI and other factors, they came up with a way to rank which mouse was the best in absolute terms.
The final results: the Logitech MX500 Optical mouse scored the highest with 78 points, followed the Logitech MX518, Logitech MX300, and the Razer Diamondback. However, in terms of bang for the buck, the Logitech MX500 still came out ahead, but was followed by Microsoft's Wheel Mouse Optical, then the Logitech MX300, and the A4tech X7. If you're a gamer, you'd do well to check out the scores and pick out the one that's right for you.
ESReality MouseScore 2007 [ESReallity]