Yesterday afternoon I walked into the local mac store (not the apple store, although there are several close by, the mac store is just closer) and placed an order for the MBP in my sig. It arrives in a couple of days BTO. It will be my first mac, although I have used macs at school for years. I have a few questions: Firstly, what exactly do clean installs do? From what I have read on these forums they are reinstalling the OS, but does this mean that iLife progs and my files get deleted? the only reason I would clean install would be to get more HDD space. Is it really worth it? Secondly, it will be plugged in alot of the time. Does this drain the battery capacity? If so, can I have the MBP on (plugged into the wall) and the battery out? Third, any suggestions as to a good wireless or wired optical mouse? Fourth, is it difficult to install more RAM? And finally, fifth, is applecare worth it? I know that is a subjective question, but I wonder what are people's experiances with applecare; is the extra $250 (student discount) worth it? I plan to keep this computer for 3-4 years. I hope this is the right area to post this in, thanks for any help you can give.