Powerbook is EXTREMELY hot

Hi,
In 2004, I got my first Powerbook and love it. I am still using the same one, and recently noticed that it is becoming extremely hot during normal use. I do keep it plugged in most of the time, and normally do not shut it down at night, because I want it to do the normal maintenance stuff during the night. I replaced the battery when Apple had the recall in late 2004, early 2005.
Is this something to be concerned about? I am looking for any opinions.
Thanks,
Dan

Dan,
First, what is very hot? If you download and run temperature monitor (available at http://www.versiontracker.com/dyn/moreinfo/macosx/19994), what's it show? While you're obviously noticing a change, having the temps is a good reference point.
Next, is something running that is driving CPU utilization, which would create heat. When you notice it's heating up, go to applications, utilities, and run the activity monitor. Do you find anything running that's chewing up the CPU?
Has anything changed recently? Did you just recently upgrade to Tiger? Do you run McAfee antivirus (which caused problems running under Tiger)?
Have you run the Apple hardware test to ensure everything is in working order?

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