As computers become faster and generate more heat it gets more important to have good ventilation, but that also increases the amount of dust sticking to the components of the computer. It's of course better to make sure the computer never gets dusty by vacuum cleaning around it (not in it) frequently. But what to do if it's already to late?

I've heard that vacuum cleaning the computer itself is very bad, since it can cause static electricity that hurts the computer. So,

Does anyone have any tips for how to remove dust from your computer?