Actually, if you'd like to get technical, leaving your computer on is the best thing to do (disreguarding electricity, and you must have good air circulation and a correctly built computer (I only say this if you made it)). When you turn it on and off, the expansion and contraction from the heating and cooling down of the processor can do more damage than leaving it on 24/7. There are millions of transistorys that have to do this when you turn it on and off, and the temperature change is extreme.
This is only the "technical" aspect of it, though.
-Steve
This is only the "technical" aspect of it, though.
-Steve