To finally be truly rid of the footage, you have to empty the trash in the Finder. It also does this with the corresponding thumbnail footage that it generated when you imported the video. Once you move your rejected clips to the trash, iMovie '09 will actually split the source video file in the Finder into separate clips and and toss the rejected clip file into the Finder trash. What happens behind the scenes here is pretty cool. If you accidentally delete something from this point on, you better have a dang good excuse.) The iMovie window is pretty obvious about how this is done. (Yes, this is now a three-step deletion process.
Once you have selected to view only rejected clips, you have the opportunity to remove them from the Event Browser and move them to the trash in the Finder. You can do this by viewing Rejected clips only in the View menu, or in the pull-down menu in the lower left corner of your window. To accomplish that, you need to take an excusive look at all your rejects. The Delete key just marks a selected clip as a reject, but doesn't actually delete it. You can read more about the reject tool in my post about the Advanced Editing tools. This behavior is a lot like moving clips to the trash. A "rejected" clip is actually just a clip marked up by the Reject tool. IMovie '09 doesn't move clips to the trash. There it lived indefinitely, that is until you emptied the trash, at which point it was gone forever. Previously, if you deleted a clip, it went to your trash. The Delete key in iMovie '09 actually works in a very similar way to the Delete key in iMovie HD. You need to delete the clip in the Event Browser to finally be rid of it. The clip is still on your hard drive, taking up space. This means if you delete a clip in your movie project, you have only deleted a reference to the clip. As mentioned before, iMovie edits by referencing source video, not copying it. I am just getting this out of the way before we move on to real, space-saving deletion. So if you select footage in your Event Browser and hit delete, is it deleted? Almost, but not yet. It is your job, however, to get rid of it. There is certainly no requirement to leave footage in the Event Browser. So which is it? Are we getting a fit Jack Sprat or his more corpulent wife? The truth is that it is up to you. Footage, just like photos, adds up quickly, just as quickly filling up your hard drive. Others have commented that iMovie '09 will take a lot of hard drive space because it acts like an iPhoto for your footage, storing and cataloging it all so you don't have to leave it on external devices like DV tapes. The idea is that your drive only needs to contain one copy of some footage, and all projects built on that footage will not needlessly multiply it like iMovie HD does. I have seen some comment that the new iMovie is space-efficient.
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