Hi. I'm gonna get a mac next year, and plan on using iMovie until I can get something better. My question, what are some of the more advanced features of it? I've used it before, but that was just to add titles and transitions, and only used it for about 2 hours at most. I've used Windows Movie Maker, and my biggest gripe is the cropping and trimming clips ect. You can't really trim them really exactly..can you do this in iMovie? What are some of the advanced features? Can it do greenscreen or anything like that? Or is it just a fancy version of WMM? thanks