That's a good article, but they don't compare battery life between the Intel GPU and discrete 330M GPU, which is what the OP is looking for.
Windows will always use the discreet graphics card which uses more power. Also, Windows power management on the MBP is not very good.thx for the link guys.
also, hows the battery life when running on windows7? i heard windows automatically sets it to the 330m? any way of changing that?