My 3G iPad absolutely kills my iPhone 3GS in terms of battery life; even though I have push turned off for email/apps on the iPhone (except MobileMe for Find My iPhone), and on for the iPad.
And as dmaul notes, unlike the iPhone, playing videos on the iPad doesn't seem to make a huge difference in battery drainage-and I watch a lot of video thru both the built-in player, Netflix, and AirVideo.
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