I'm new to Mac, having purchased the new 17" MBP last month. The majority of my time is spent at my desk with the machine plugged in, I go mobile here and there. When I'm finished working for the day, should I shut down my mbpro completely, or just close it and put it to sleep? I saw somewhere someone talking about rarely ever having to reboot their mbpro. Having come from a clunky HP windows laptop, I was constantly rebooting and out of habit always shutting down at night. Does that tax the machine making it turn off and on every night/morning? As a quick aside, there's nothing wrong with keeping the machine plugged in all day? i.e. should I periodically let it run on battery for any reason? Thanks for your feedback.