When I've finished my iMovie projects I only want to save it in the highest possible .mov format so I can watch it on my Macbook, but also use PS3 video 9 to convert it to a PS3 readable .mp4 file, therefore don't see the point in finalizing the project as this saves all file formats and assume this will tak up more storage space. However, when going through the iMovie help it says:- "When youre finished creating a project, you can finalize it. With this process, iMovie prepares (renders) your movie in all of the possible sizesmobile, medium, large, HD 720p, and HD 1080pthat your projects media supports. (Sometimes, the original project media isnt large enough to render in the largest sizes.) You dont see the finalized files in iMovie; rather, iMovie uses the files when you share a project to MobileMe or a social media website such as Facebook or YouTube. When you finalize a project in advance, the process of sharing a movie takes less time. Finalizing a project also improves full-screen playback because iMovie also uses the rendered files when you play a project in full-screen mode." I'm interested in this last sentence I've highlighted. Does this just mean playback through iMovie is improved, or will I see a difference when playing back the saved file, and/or also when playing back on PS3? Cheers.