I overclock my laptops. Not all the time, but when I'm playing games it helps. It really depends on your processor. Most manufacturers offer a wide range of processor speeds on the same laptop with the same cooling. I have 2 laptops of the same make, one has a TK-42 (20W TDP), and the other has a TL-66 (35W TDP). That's a 15 watt difference! It only seems logical that you could push lower end processors to slightly higher speeds and the cooling would handle it.
For example, I have an amd based netbook that has choppy playback on hd youtube videos. After a small 200mhz overclock they play smoothly. The temperature only goes up about 8 degrees under load. You could do an overclock and run super pi to see if it's stable. If the overclock isn't stable, then it isn't meant to be.
I use "setcpu" and or "rmclock". It's super easy to do, all you have to know is your clock chip info. More than likely someone has figured it out, just google your laptop series + overclock.