Me and a friend are having a discussion at work about mouse acceleration and its usefulness in gaming. Some people have it off, some people have it on. If you have a gaming mouse with software installed for it, chances are you have acceleration off. Mouse acceleration is on by default in Windows.
Take this test on level 1. Do it about 10 times and post your best time, and whether or not you have mouse acceleration on or off.
.:: GameWeex ::. Mouse Click Test - Free Online Flash Games
So far my best is approximately 10.86 using a Dell ball mouse (which in my opinion is the best type of mouse for gaming).
The reason this is so interesting to me is due to its effects on how good I am at games. When I had mouse acceleration on, I was really good at sniper in TF2, and I used to be a raging death machine in COD4. When I turned it off when I bought my Logitech MX518, I started sucking at sniper and at COD4, but I got better at Heavy and Pyro in TF2, particularly with tracing targets. But anything involving sniping or precision I simply sucked at.