For my business, I desperately need a powerbook. I've been holding off as I simply could not afford it, but for Christmas, my dad offered to pay for half! So, I'm going to order a new 15" like tomorrow. The thing is, I've never had a laptop before. I've hardly ever even used one. I've been using desktop computers for as long as I can remember, but when it comes to laptops, I'm definitely a newb. So I've got some questions, and I apologize if they're a bit basic: If I buy a laptop and add aftermarket RAM (from Crucial), will it void any part of my AppleCare protection plan? Are there any things I should do to "prep" the machine as soon as I get it? Like charge the battery all the way, and then let it drain all the way? I think I remember reading a few tips on here in the past about things like this, and of course I can't find them... Is it generally a good idea to let the battery completely run out before charging it again? Does it matter? How much power does the machine use when it's asleep? Could I basically let it sleep for months without the battery *completely* dying? I've always just been curious about this... I can't think of anything else right now... any responses to these questions or any other tips would be greatly appreciated. Thanks!