I just cleaned my Mac Pro after 1 year and WOW, did I ever have an eye opener. The clumps of dust that blew out were amazing, I cleaned it occasionally with a fine brush and vacuum cleaner to pick the dust from the air. This time I used an air hose and my air compressor and WOW what a difference. I have seen my temps go down by 20 degrees across the board on my memory with iStat Pro. I guess this was a good thing. Now I need to come up with a filter of some kind, as I really don't care how it looks, as long as it is functional.