iMovie is DV-only?
I wish I could help you, but I've yet to successfully import any video (MPEG, DivX, QuickTime) into iMovie (version 3 here). Near as I can tell, iMovie is ONLY compatible with DV video, which means you need to buy an external analog-to-DV converter and pass your videos through it to re-record them to your Mac. Seems like an overly complex and time-consuming method to me, but it's all I've been able to find on the subject.
I would greatly appreciate any hints to shortcuts.
Don Eitner