Fan seems to be constantly on

Hello,
I have a Late 2008 Macbook Pro 15" (2.4 GHz Core 2 Duo with 4 gigs of memory. I am running Snow Leopard (10.6.2). I upgraded in mid September. The past few days I have been noticing that the fans seem to be on ALL of the time.
I have an iBook as well and I was very impressed when I got the Macbook Pro because its power, heat, and fan management was great compared to the iBook. I have never asked myself, why is the fan powering and why is it loud.
Take today, I am working at my desk and I am running Safari with 3 windows open and Photoshop CS4. Nothing else. I am not doing any heavy graphics and only manipulating text. I downloading a Fan Control and with barely anything I am running at 61.5 degrees C with the fans running like crazy.
The RPM is 3637 both of the fans.
As I am writing this post I have restarted and did a SMC reset. I have one window open and the fans are running, much more quiet but I can still hear it. Temp is at 52.9 C and the RPM is at 2022.
Why am I all of a sudden noticing the overheating and fans when nothing has really changed.

I have the same issue. I got this computer in June and was amazed/took note of how quiet it was.
Towards the end of the summer, it started running very hot and the fans were on high. I did the smc reset - the heat dissipated and the fan speeds went down. BUT... ever since then I hear the fans. They are running at 2000 rpm +/- 10 rpms. I am also getting a slight, but before non-existent, vibration through the keyboard - this is something relatively new.
I almost feel (or at least they sound like) the fans are running above 2500 but that istat pro and hardware monitor are getting inaccurate readings of 2000. I don't know if that's possible but I spent a ridiculous amount of time trying to figure this out, and that's the best I came up with.
I had the fan replaced by Apple, reinstalled Snow Leopard, cleared some system caches, did all the resets (smc, pram, battery). But no results.
I talked to one Apple employee who has a new 2.66 and he said his was silent - while mine I constantly hear the woosh. I also have a white MacBook which is whisper quiet - and similar to what this MacBook Pro was when I first got it. (The problem they have when trying to diagnose it at the Genius Bar, even if they bring it in the back, is that the store's noises cancel out the woosh that is otherwise evident in a normal office setting)
If you find out anything let me know and I'll keep you posted here.

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