Over on the MacNN boards they started one forum topic specific to new OS X users. You can read about things like partitioning, what is Aqua, where things are, what is the terminal, and more. However, the MacNN boards are currently being updated with new bulletin board software, and the thread is not available. But they were nice enough to move the thread to this mac.com page so that you can read it until the boards return. They have some good info, so check it out if you're new to the world of OS X!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20010313091322535