One other thing to mention: Don't expect Mac OS X to do things like you were used to in Windows. While it's pretty similar, there are some idiosynracies that are different than on Windows. Like the fact that closing the window from the red button doesn't quit the app (because of the nature of the Finder). Also that installing applications is usually a matter of just dragging and dropping to the Applications folder on your hard drive....although this is a good thing..
Just be open to the Macintosh environment, and it will be a joy to use. Expect it to work like something that it isn't and prepare to be burdened by self-induced frustration.
Just my two cents on the subject.