Loud fan and hot macbook

Hi
Just in the last week or so I've noticed my Macbook gets really warm after about half an hour or so and the fan (I think) gets really loud. I'm not normally running much maybe itunes and safari and thats it.
Does anyone know what the problem might be?
Thanks

Go to Applications/Utilities/Activity Monitor. From the pull-down menu in the middle, select "All Processes" (default is "My Processes"). That will tell you if you have a runaway process running in the background.
However, depending on what you're doing in Safari, you could still be causing the high CPU load--a lot of video, for example, will cause your machine to run hot.
Good luck!

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