My Q6600 is at stock speed and my load temps are about 57C, ok right? But at idle its at about 43-47C, i thought it would be lower?. I am at 1.15Vcore using AC freezer pro 7.
I wouldn't worry about it too much, but to pursue it you'd want to make sure your internal case ventilation is sufficient and that the cooler is properly mounted with not too much thermal paste. Try running for a bit with the side panel off the case.
That's about what my Q6850 idles at in an HTPC case with the same cooler when I run it stock. The case (Zalman HD160XT) happens to cool pretty well . . . for an HTPC case.