Screaming Fans - new after over a year

Hi. I've had my MBP (C2D) for over a year. Recently, the fans have started screaming. At the momebt, they are at 3200 rpm and I'm only running Word and a Firefox browser, with 3GB ram and an external 1680x1050 monitor.
Any ideas?
BTW, I'm used to running the machine 'maxed out' - with Windows XP in Parallel taking 1.5G of ram, plus Photoshop CS3 and Lightroom and Entourage and Word, etc. When I do that, the fans totally scream (5000+ rpm) and I can understand that. (Incidentally, shutting down Entourage often stops the fans. Gee, I wonder why).
But now, I'm running almost bare-bones and they are still going up and down between 2500 and 3200. Any suggestions.

One thing to try. Open Activity Monitor and set the upper window to "All Processes". Check through the CPU column and see if anything is running that shouldn't be and using a lot of CPU. Sometimes a process will hang up and cause lots of heat and fan activity.
Right now I have 7 applications open and the CPU is 93%-98% idle.
I presume both fans are running at about the same speed? If one were at zero, I would suspect a thermal sensor had gone out. But it might not hurt to run the Apple Hardware Test anyway just to be sure the thermal sensors are functioning properly. If not, you'll get an error code with "SNS" in it.
Good luck!

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