http://www.hardwaresecrets.com/artic...er-2011/1430/5 has done some reviews on different thermal pastes, however another source I was reading put AS5 a bit futher behind new ones (it is a few years old now) so I dunno, trying to find the other review.
Here's another set done by Tom's Hardware that includes liquid metal thermal compounds, seems similar to the other one I saw.
XI Wiki



