Standard processor temperature for a high-end notebook?

Howdy.
I own a Gateway notebook equipped with an Intel Core Duo 2 T7200 processor and I frequently monitor its temperature. It used to sit between 46 and 49 degrees (C), but recently the temperature has shot up to upper 50s.

Nothing has really changed in the amount of load I put on the processor, nor has my computer's physical setup been altered (ie, I leave enough space around the machine).

1) What are some common causes for such spikes in temperature and 2) should I be worried? I'd like to get a laptop cooler but I'm having trouble finding one that'll fit a 17" widescreen.

Thanks for any comments.

Jam it back in, in the dark.

85 degrees? Holy crap, I didn't realize processors go that hot. I guess I'm not as worried now. That Xpad thing is interesting; I hope to get something soon that cools my computer.

As far as the task manager goes, I check that often: nothing out of the ordinary aside from Firefox using more memory than it should. Thanks for the responses.

There's nowhere I can't reach.

I've had this computer since early November. So it's not that too old yet.

This thing is sticky, and I don't like it. I don't appreciate it.