For what it's worth, I found a two-part guide to laptop graphics for ya, Div. It's a little old (2005), but a lot of the info is still useful.
Part 1
Part 2
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In more current reviews, I found a fairly up-to-date forum with laptop video card rankings:
The Mobile Graphics Card Info Page
And here's a neat graphic that ranks the cards, although I'm sure one could quibble with the choices. Still useful.
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