Aye, cleaning out the machine is a good idea.  I do mine - when I remember - fairly regularly.  Even though it's on a shelf, it still gets full of dust and cat hair.  Not only do I clean the fans, I get a toothpick into the processor heatsink and give that a good going over.

Another thing to consider is, if things are getting too warm even then, stick a desk fan near it.  Obviously, not right on top, since the EMI from the motor won't do your machine a deal of good.  :D

Coppula eam se non posit acceptera jocularum.

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