Since upgrade to 10.6.7, fans speed up and never slow down

I have an Intel iMac, 2.8 GHz i7, 8GB RAM
Just as the subject line indicates:
After upgrading to 10.6.7, when my iMac starts to heat up, the CPU fan RPM will increase but it will not slow down until I reboot - even if I allow ample time for the machine to cool down and let it sit idle for hours.
Right now, the CPU temperature is only 100 degrees F, utilization is at 1%, and the very loud CPU fan is still running at 4000 RPM.
I've reset the SMC multiple times, and this doesn't help.
The most telling aspect is that in the seven months prior, the fan would slow as the machine cooled off. Not so with 10.6.7
Anyone else experiencing this?
Thanks

Resetting the SMC was my first thought, but you have done that. You might also try resetting the PRAM/NVRAM:
http://support.apple.com/kb/ht1379
After that if the issue persists, I would call AppleCare.

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☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
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Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
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In the Console window, look under User Diagnostic Reports for crash reports related to the crashed process. The report name starts with the name of the process, and ends with ".crash". Select the most recent report and post the entire contents — again, the text, not a screenshot. In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.) Please don’t post shutdownStall, spin, or hang logs — they're very long and not helpful.

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I have have setup Speedfan according to parameters posted in this forum.....
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What have I done diffferently????.....I have no Idea....I have a Couple theories..but just guessing here.....
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I'm having problems with my new and otherwise immaculate iMac Intel 2.4 GHz. The CPU fan often spins up to 3500 rpm for no reason, even when left idle.
There are no processes running to justify the noise (no Spotlight indexing or anything) and the temperatures are as low as can be.
I have tried resetting PRAM and SMC many times to no avail.
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Installing SMCFancontrol will not help as it will only let you speed up the fans further - not slow them down.
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Since upgrade to 10.6.7, fans speed up and never slow down

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