I kinda want to do this with my HTPC, because it's so durn loud. The biggest thing that's stopping me is that I'm afraid the oil will go rancid. Supposidly the computer creates a warm environment that makes stuff start growing in the oil. Aparrently the way to go is to use a
petrolium based (non-organic) oil. I seem to remember someone saying that the best oil would be completely clear (which would look a LOT better too).