A large guide, often criticized for the lack of information and inclusion of the Logitech G500, due to a poor sensor.
The mouse along with a keyboard and monitor is one of the most used parts of a computer. As such it is importand to get a quality mouse that supports the hand (and wrist) well. Some mice are prone to breaking or being overpriced. Many mice have more features than just clicking which some power users may appreciate. Some mice are more suited to gaming than others.
Another guide, slightly more descriptive and lists pros and cons.