Apple’s iMovie HD (version 6) is the venerable video editor that users were so fond of that Apple offered it as a download after releasing iMovie ’08, which was not well received. The current version is iMovie ’09, which is included with all new Macintosh computer purchases or available separately in the iLife suite. iMovie HD is no longer available for download. If you still have iMovie HD available to you, it is a very capable editor and one to consider before you upgrade to something like Final Cut Express.
The video above is the introductory video from a playlist that you can use as a guide for how to accomplish basic tasks in iMovie HD. Each video will play in turn (with a slight delay between videos). You can view an alternative version of the playlist that allows slightly easier navigation of individual videos.