I was a bit curious after watching a video on how a YouTuber edits 1080i high definition video on a 1.33 GHz iBook G4. Whenever I try HD on my G5 or PowerBook G4 it is a very choppy process in iMovie '09 and I do not have an older copy of Final Cut on there anymore. That being said, they are fine machines for quick editing jobs and I do enjoy my dual displays on my G5. My ultimate question is what version of iMovie is best for PowerPC systems and will run the fastest? From what I can tell, I think it is going to be iLife '06 but I wanted to be sure.