Hey Lumberman,
Throughly impressed with the Evans Tech and the technical info that they submit. I think this idea makes much more sense than a water based system just from the standpoint that you don't have to reduce surface tension to accomodate a higher heat disipation. Furthermore, no pressure to cause cavitation under evaporation or the blowing of hoses.
Really interesting concept. I suggest everyone look at the data, it's pretty solid.
http://www.evanscooling.com