http://macmost.com/e-753 While iMovie only lets you include one picture-in-picture at a time, you can use Keynote to merge multiple videos. The technique involves putting many videos on one slide, and then exporting the presentation as a new video. You can use this to create a variety of effects.
Whether you use your Macs for personal or business use, chances are you aren't using them enough. Use them more! Use them for everything! Rule the world!
