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I would say Digital Video or Mac Apps depending on the nature of the question.

Digital Video for questions about importing, editing, workflow, etc.

Mac Apps for more general questions like installing, version numbers and system requirements, etc.

That’s my best guess
 
I'd say it's Digital Video for iMovie questions.

You could ask in, say, the PowerPC forum if you're dealing with iMovie for OS 9 (because that would give a better answer than the DV forum, most likely).
 
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I had the same question… My MacBook Air just got filled up with iMovie projects now I need to, (I guess?) get an SSD Drive and somehow move iMovie to it?
 
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