Overheating and fan on Macbook Pro.

Hi, I bought a new mac book Pro several months ago. It was perfect and still runs perfectly, but recently I noticed that its starts to get very hot and the fan start to kick in, which never happened before. It happens whether I run processor intensive app. like final cut or something minor like Firefox. Fan never kicked in before.
I am wondering what it could be? Left side speaker side of the laptop especially gets hot. The rest of the laptop is warm. Thanks a lot
MacBook Pro, 2.33ghz Mac OS X (10.4.7) 2GB RAM.

Also the left side of the laptop has more things to heat it up such as the hard drive and power port. My laptop also gets hot on the left as well but i do not really mind as the fan changes speed when the temp changes accordingly. If you want to manually control the fan speed you can use a utility such as SMC Fan Control or Fan Control. I just like to leave the fan settings as is because I don't want to rely on third party software to fix something that was meant to be as is but I have tried Fan Control and after I removed it the fans became back to the default settings.

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