If you're like me and you've just installed the latest iLife suite then you'll know that there have been some major updates especially to iMovie 09. This quite detailed exploration the new features is enhanced with some great screen grabs to support the explanation. The only minor quibble is that the tutorial is a one page presentation which because it is image dense, can take a little time to download.
Why spend money on expensive multimedia tools when you can use comparable alternatives for free? They may not be an exact replacement, but how can you argue with the price?