I made the switch awhile ago and love my PB. I have read this forum for along time, and came across a few posts that I have a question about. I have read that alot of you do not turn of your computer but leave it in sleep mode. I was wondering if I should do this with my new PB??? I have turned it off when I am not using it for the past few weeks. What are the advantages of sleep mode other than a very fast start up time?? Thanks for all of your help.