I just came back from the alienware website and didn't see any sort of netbook.
I'm begining to think antistealh is using netbook as a generic term to cover all kinds of laptops.
Of course you can do it on a laptop. I've only seen several with locked multipliers. And it's an alienware ontop of it. But I would be VERY cautious. The netbooks have little/no fans, therefore could get EXTREMELY hot, not to mention that the atom is not made with the intentions of overclocking.