I've had the same concerns with a Core i3-2120 here. I paired it with an Intel DH67BL mobo and it's using the stock HSF. I've noticed idle temps at around 60C. Ambient room temp is around 32C. If the Sandy Bridge design is so energy efficient, why is this i3 running hotter than my Phenom II X4, which idles at just 35C? Even reseating the heatsink didn't help. Now I see other people experiencing high temps with their SBs. I gotta wonder whether Intel's silicon isn't as stellar after all as they seem in reviews, or Intel is simply bundling worse-than-crap HSFs with their chips. I think review sites should look into this.
Perhaps I should get an FX after all and see for myself how it compares to the i3 here.
AMD FX-8350 / Gigabyte 990FXA-UD3 (rev. 4) / 2 x G.Skill Ripjaws 4GB DDR3-1866 / AMD HD7770 1GB / TP-Link WN723N USB Wifi-N / Samsung 840 EVO 250GB / Hitachi 7K1000.C 1TB / LG ODD / Cooler Master GX650 / Aerocool VS3 / LG W2252TQ / Win7 64-bit