Clean your laptop. Mine dropped 10-15C just by using a compressed air can on a regular schedule.

You'll need to open up the back, and blow the fans. Also hit the side ducts, and anywhere else air is supposed to be flowing.

(Aside: for me, voodoopower keeps it 10-20C cooler than without it. Unfortunately, it panics the machine every couple of days. So rather than sleeping, I try to shut it down at night. I've been planning on debugging this because superhai can't do anything without a traceback, and I never get one using his debug kext.)

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MacBook Pro - have allergy to nickel in the aluminum casing. So my kid gets an expensive toy!

Gateway MX 8738 - Retail, vanilla Snow Leopard 10.6.2 (thanks kizwan!) with Chameleon RC4, modified DSDT. Upgraded to Core 2 CPU (easy to do). Upgraded to 640GB drive. Everything but SD card working. Minor niggles. GMA950 with QE/CI and *no* artifacts.

iMac (luxo/lamp) G4 with Tiger.