be careful about trying to treat your notebook like a desktop, I turned all the sleep modes off on mine to save time, its less then a year old and I recently had to purchase a new fan and replace it as the old one was making horrible ticking noises in low revs (2000rpm) and clattering like an old Tford in high revs.
I know I could have sent my macbook back to apple but I love tinkering and replacing the bits in a macbook is a cake walk compared to operating on an iBook, which I have also done.
treat it with care, when your not using it shut the lid, sounds trivial but many people ignore that, also watch your apps especially SAFARI some websites make the CPU go like a saucy minx, and that makes your fan max out, if you hear your fan doing this and you aint encoding video, or doing something really CPU intensive, check the activity monitor to find what is doing it.