A while back I got inside my laptop to clean it out. Latent A+/Net+ skills. I found that the heatsink is only attached to the processor and does nothing to cool the DIMMs or the video chipset -- that's all supposed to cool through the bottom of the computer, and the bottom of the computer is not good at that.
Since getting an Android tablet, the laptop as pretty much been a desktop. I set the laptop on The Miracle Thaw and CoreTemp reports a drop in temp of about 10°C. More importantly, when temperature does spike, it cools back off much faster than it did previously and without the fan kicking on as hard or as long as it used to.
I've used many, many cooling pads over the years. The most effective ones are the ones with LOUD fans. I used to hook them up to switched power supplies so I could go from a couple volts to 6.5 volts. (They're designed to run at 5v, but they lasted.)
This is a massive heatsink, and works really well. The one problem was that I had to raise part of the laptop just a little because the fan intake is on the underside of the computer. It's not making full contact at all points, but is doing an excellent job anyway.