Ninjalane has posted their review of the HTPC ready heatsink from Thermalright.
There is no doubt that the AXP-140 does considerably better on Core 2 Duo and Core 2 Quad but if you are looking for a low profile and silent cooler for the Core i7 the Thermaright AXP-140 should be on your short list to check out.Thermalright AXP-140 Heatsink Review