I keep mine pretty well looked after. I always clean it on a regular basis. When I\'m not planning on using it for any length of time, I always unplug it and cover it with a cloth to stop dust settling on it. I don\'t keep drink or food near it, and there is nothing near to obstruct the fan at the back.
As for the games, they are ALWAYS kept in the box, in a neat pile next to my PS2. I NEVER touch the surface of the discs, I handle them by putting my index finger through the hole on the centre, while holding the side with my thumb. I have old PS1 games that I have had for years that have barely a mark on them, I could trade them in for a decent ammount they are in such good condition.