How do I stop my 2008 Macbook from constantly running hot?

I have a Macbook 13" early 2008 model (NOT pro) running on Snow Leopard that is constantly hot with the fan being exceptionally loud from the first minute of use until I put it in sleep mode or shut it down, especially when running flash, silverlight, watching videos/movies, playing music (which must be on loud to compensate for the loudness of the fan), etc.
I recently took the following steps to a more permanent solution to the problem, with no luck:
Upgraded from Leopard to SL.
Installed extra memory (I now have 4GB ram instead of 2GB).
Deleted many items to ensure more available space on the computer (now have about 70GB free).
Opened up the laptop and cleaned the inside of dust (there was quite a lot after 5 years!). I also disconnected the fan and carefully cleaned this of dust as well (no components were harmed during the cleaning).
These steps have not been effective - in fact they do not seem to have made any difference to my heat problem. The only differences in my computer's performance are the obvious changes that come with upgrading from Leopard to SL, and that startup is about 10 seconds quicker (after installing more ram). My laptop is, in fact, scolding hot underneat and sounds like a jet taking off this very minute as I'm writing this question.
PLEASE if you have any solution for me at all (hopefully inexpensive, as I've been through quite a few expensive steps already) write them here and help me with my problem! I've had this issue for the last year or two, and am tired of not being able to have my LAPtop on my LAP because it will burn me.
Thank you!

Thanks for the suggestions Mike.
However, like I stated before, it's not just those activities that make it run extremely hot - even something as simple as writing this entry makes my computer feel like it's on fire and sound like plane engine. That's not normal.
I should have included in my question that I already have reset the SMC.. twice... Using the exact method you describe in your answer. Power off, remove MagSafe and battery, hold power button, reverse the steps and turn back on.
I also have been using a usb-connected cooling pad with three fans for the past year. It does prevent the laptop from heat of the laptop from touching me directly, thus making it less uncomfortable, however the computer still runs just as hot when on the cooling pad and also just as loud. I'm looking for a permanent solution.
But thank you for trying to help

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