I'm selling my laptop on Craigslist. I'd like to clean install -both to protect my files, and to give the new user a clean slate. Unfortunately, I lost the install disc (I bought it ~5 years ago). Can anyone tell me how to do a clean install - or at least do something reasonable - without an install disc? Since I'm selling this on Craigslist, I don't really want to spend $30 to upgrade to 10.6. Would it work to create a new account, then delete my current account? Or would my files still be vulnerable? Since I own the license to 10.5, could I download it from The Pirate Bay and use the serial number that came with the computer? Where would I find the serial number? Thanks!