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: http://www.frostytech.com/top5heatsinks.cfm
You can use the Google embedded search feature at the web site to find more information about heatsinks for Intel socket 1156 cpu's.
EDIT - Tom's Hardware publish a brand new review of socket 1156heatsinks this morning: http://www.tomshardware.com/reviews/lga-1156-heatsink,2535.html