Creating a split screen video of a multitrack recording It's fairly common to see videos in which, to accompany a piece of music created using overdubs, we see a split screen showing the artist performing each overdub.

What functions, in which software, may be used to create videos like this?

Is it a matter of mixing the audio separately, then manually synchronising the video, or is there software that automates the process?

Answers for any software are welcome, but budget answers (iMovie, Movie Maker) are welcome, as well as any software designed for this specialised purpose.
WAX is an freeware video editing program. 

You can create a split screen effect with either a source image or AVI video file. Import then source files into the MediaPool (Project -> Insert Tracks) then position them on seperete layers on the timeline.

From the MediaPool change to the Plugin Presets tab and drag the desired split screen effects over the video/image you wish to apply.

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I've shown an example above, in the second screenshot you can see I played with some of the settings to adjust the width of the split screen. You can also change the size and position of the video.