Hi, I ordered Alu MB 2.4Ghz from amazon and will be arriving anytime today. I just want to ask you some tips and the things that I need to install or download from net. Sorry for the very general question, this would be my first MAC ever and I only know very little about this machine/OS. Thanks in advance. Edit: Could you also please tell the things I need to check to make sure that I got a good unit?