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The first thing I noticed with my laptop was that the mouse acceleration was just plain wrong. I'm used to using windows XP and the mouse movement works great. But with the mac, movement jumps from super slow to super fast. There is no medium speed. Its even more irritating with the scroll wheel because medium speed scrolling is best for scanning a website.

So I started searching around and there are a number of people who have also noticed the problem and done something about it. Here's a more complete explanation of the problem. 

I downloaded the program SteerMouse which installs as a driver. It isn't free, but I'm willing to pay to remove irritation from my life, so I'll probably be a customer if it doesn't cause any problems. But so far, just by installing it thngs are much better. It even seems to have fixed the acceleration of the trackpad.

There's a number of other programs out there. I haven't tried them all. But a search for "os x mouse acceleration" leads to a number of possibilities.