I’ve gotten used to ‘natural scrolling’ on my macbook. The problem is that I haven’t gotten used to it when using a mouse. This means that when I attach a mouse to my macbook some funny things happen and it is a bit frustrating to use. There are two check boxes in OSX’s preferences: one for the mouse and one for the trackpad, oddly enough they’re linked. Thankfully there’s a product out there called scroll reverser that takes care of the problem. It allows me to revert the direction for the mouse only, and so far works great.