I'm sure that you have all seen this before but I thought it was kinda cool. Also a little vid at the end of the article!
http://www.tomshardware.com/2006/01/09/strip_out_the_fans/index.html
Ya, at one of the previous Fragapalooza's a guy had the acyrlic case full o' oil (and no heatsinks), pretty neat to see in R/L
First thought.. Cool I have read about this before.
Second thought.. Messy, I wouldn't try it.