They do exist. I had one on my last computer but can't remember what it was called.
One of the ones I had you could even control your fan with it. Like making it run regardless of temp.
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I run a thing called "motherboard monitor" on my PC. Not sure if it would work on a laptop, but I suppose it's would be worth the try. Plenty of places to download it from on a google search!:)
I finally found one it's a freeby : http://www.almico.com/speedfan.php
It says on the dell website that motherboard monitor wont work on thier laptops????