what are you asking here? do you want to buy a new laptop and want to know which chip you should be on the lookout for? or do you want to upgrade your current laptop?
if 1: there are some very good graphics chips in laptops these days, in laptops under 15" you will generally find integrated stuff, or at best a geforce 7300 or ati 1400, 15" laptops can house cards up to geforce 7600 or ati x1650. for the absolute top of the line (geforce 7900 or ati equivalent) look for a 17" lappy
if 2: short answer: no, longer answer: a while back a few firms (including ati/nvidia) tried to set a new standard for laptop cards called MXM, basicly PCIe in a laptop form factor. some laptops support this, and if your laptop does, you might be able to find such a card, but this will be hard, it wont be cheap or easy to find the correct card (mxm has three variants, each with its own TDP and size constraints) and chances your laptop has mxm are minimal
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