Husky, try doing this (I do it every month). Unplug everything from your PS3 and set it standing upright on a table, Blow hard through every single air vent and then get a straw and blow through that into the corners, USB slots, disc tray etc. If your up for it I suggest using a small hoover on it. It's hard to describe but use one of those add-ons which makes the end of the hoover a small pipe. Put that against all the big air vents.
There you go! Your PS3 will be almost 5X more quieter! I do this all time so don't worry about damaging it, but it's up to you if you want to do that. It REALLY helps mine because I live in a very hot country and things get dusty here very easily.
Oh, and also make sure your PS3 is in a nice open area. If you have your PS3 on a carpet, you might want to move it onto some hard floor or stand it upright. If its just on a normal floor lay it horizontally. This works because hot air travels up and if the PS3 is more spread out the whole console will generate less heat. But if you have it on a carpet the soft carpet material will have more places for it to get hotter thus your PS3 getting hotter. Get it?