I'm rockin an E8400, and it's been nice and solid. Pulled a decent overclock on it so far, but nothing too extreme.
I havent done any gaming on it yet, but I did get some pretty good scores on 3dMark and Aquamark. I just bumped back to Vista today (good bye XP X64.. you flaky bastard) so I'll be trying out a few things with it soon. Check out my "Throttle Junkie" build for screenshots of benchmarks, and some build pics.
Also, Berticus Pryme built an almost exact system as me, but went with the q6600 instead. You can talk to him about this scores as well, he posted a few things into my build thread also.