Coming from the RealTemp guy this is going to sound a little dumb but temperatures really aren't that important. Cool them as much as you can afford to and they will be able to overclock more. If they are not stable, cool 'em some more or back off your overclock. That's really all there is to it. No fancy temperature monitoring program needed.

gymenii: Your CPU looks like a winner. Two sensors that actually work and both of them on the same CPU.

They must have manufactured that one on a Wednesday. No way it could have been built on a Monday or a Friday.

JohnZS: When you start overclocking Core i7 and feeding them lots of voltage, they start consuming and putting out a lot of heat energy. Far more than Core 2 Quads, especially when you enable hyper threading and run 8 threads of something crazy like LinX.