So I've my MP for only about a month and fly mostly around water as I live in Pensacola Beach. Doing lots of videoing and got a new MacBook Pro 2 weeks ago, primarily for working on movie clips. I got the 15 inch 500GB model and was quite unsettled when I got a message a few days ago that I only had about 55GB left. WOW! I'd only done 5-6 short movies between 2-3 minutes and one 4+ minute movie of a friend windsurfing. I knew I'd eventually need an external HD but didn't think I'd need one after just 2 weeks. I gave Apple a call as I have AppleCare and they hooked me up with the App Department help and was able to delete the cache of video I'd accumulated in FCPX, which totaled 205 GB. So, I just ordered a LaCie 2TB external HD and will be using that after I format it but it was good to learn how to delete cached items from FCPX. Do others out there using this program know how to perform that procedure?