yeah I followed his link, made much more sense then. I think I'll have a go at it too, but when "lapping" the heatsink is it the same process as for the CPU? and can you see how concave it is as clearly as the CPU pics in the link?

One other thing, I'm surprised you guys are getting such high temps on your CPUs, I'm maxing out at 60c, I hardly see 61c and the outside temp here is 30c constant, but I do have the AC on which brings room temps down to 23c-26c, or are you getting such high temps because you're running your CPU at 3.7Ghz or probably more now since it looks like you're testing (again)..