Today it is very easy to find videos and tutorials to teach you how to do just about anything from changing the oil on your car to knitting a sweater. The other day I was listening to a podcast called The Final Cut Grill, by Chris Fenwick and stumbled into a great tutorial site for Final Cut Pro X and iMovie. The site is produced by IZZY VIDEO. The thing I really like about this tutorial is that sample media is provided, instruction is easy, organized and clear. Oh, and its free! So if you are just getting started and want to learn how to edit, this is an awesome place to start.
NOTE: He has not yet updated his iMovie tutorial to the latest version of the app, I am sure he is working on it.