I have a question regarding Snow Leopard and upgrading it. I have a 15" MBP with Snow Leopard already on it (bought the upgrade disk and installed it myself w/ no problems). I want to reformat my hard drive and clear out a bunch of the stuff that's on my HD. 1) Is the Snow Leopard upgrade disk a complete OS install, or just an a way to upgrade from older OSs? (if its the former, that's a really cheap OS disk!) 2) I have everything backed up with Time Machine. Everything that i have on my HD right now - movies, music, school documents, 3rd party applications, etc - will be restored when I restore my computer from Time Machine, correct? I've read that some databases and caches won't be restored, that i can understand. I also read that some people have had issues with iTunes having to be reauthorized. also, will I have a bunch of software updates waiting for me after I reformat and reinstall? Please let me know as soon as possible. sorry for all the questions, just paranoid after what happened last time I messed around with my hard drive (for those of you wondering, I tried to partition my HD to run Boot Camp, and ended up accidentally erasing the entire hard drive, and i didn't have anything backed up! trust me, lesson learned haha!) thank you!