ExactMouse acceleration killer:
ExactMouse from Steelseries removes mouse acceleration on the Mac.
Acceleration is a a problem for me when using a mouse on any computer that requires precise pointer placement. It is not easy to disable it completely on the Mac without using some fancy terminal command.
To make it easy to disable acceleration either term-rally or permanently you can use the ExactMouse tool from Steelseries. The improvement in general mouse work are subtle but noticeable and improve the feel of high quality gaming mice.
Download from steelseries site.