I installed the brand new Thermalright Venomous X in my Intel Core i7 860 system. The Venomous X is an updated version of the Thermalright Ultra 120 Extreme. It was designed specifically for the new Intell socket 1156 and 1336 cpu's. Very cool mounting system makes installation a breeze. Preliminary thermal testing during a torture test at 100% load revealed the unit has excellent cooling capabilities. I'm satisfied.
Here is a link to a very good web site with a lot of useful information about cpu heatsinks: