Cooooweeee i just did my biggest overclock ever. E8400 @ 4.05(1.36v) with OCz reaper 1066 @ 1200 Mhz 5-5-5-15, 2.1v. on the 2.66D strap.
Bumped up pci-e/fsb/mch voltages by .15 . I had to play around with memory timings to get it to stick but after about 10 boots its ok.

Interesting that the system temps are about the same as defaults, Cpu is a little higher but not much.

I've had alot more success in overclocking with 45nm CPU's than any previous models so theyre definately worthwhile for anyone thinking about getting one.