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Get serious or don't bother.
SMC Fan control + iStat widget
On my MacBook Pro early 2011 core i7, yada yada, SmcFanControl controlled one of my fans great, but pegged the right side one at 6000. After lots of fussing around and reseting the System Management Controller, etc, it just didn't still didn't work. Got my fan un-pegged but running SMCFanController again immediately pegged it back at 6000.
Fan Control (from above link) works! As soon as I installed Fan Control from above link, heard my right side fan spin down. Interface is simple and very clear and controls both fans great based on moveable linear curve. Was so happy I donated $10 on the spot. Something about people not asking for money makes me want to give it to them.