I consider myself a savvy Mac user, but this one has me flummoxed. We've taken all kinds of video of my now 7-month old son. And it's all found it's way on to my hard drive to be messed with in iMovie. When I delete a clip, I can see the multiple MB (or GB) that are cleared off the hard drive. But when I trim/cut/crop a clip, I don't see that same space savings. I'm down to 8GB, so I need a bit more space. Is there a way to trim off unwanted footage without dumping the whole clip? Or do I need to start burning these clips to DVDs?