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I'd like to point out that it is a falcity to believe that more pixels (i.e. 480x640 vs. 320x480) are directly related to higher battery consumption.
The main battery drainer is the backlight of the LCD screen. As long as the surface area (i.e. 3.7") of the screen doesn't change, you don't need more or less battery to power the screen, no matter whether you are dealing with VGA or QVGA.
Quick LCD tutorial. Basically you have two grooved plates with liquid crystal molecules sandwiched in between. The display works by applying a voltage to the 2 plates which causes the LC molecules to align in certain ways. Now, when we move to a higher resolution screen, we have plates with smaller grooves and more (smaller) LC molecules. But the voltage is still applied to the plates. Therefore, since the plates are the same size, they require the same amount of voltage to power the entire screen. It is simply the number and size of the molecules in between that gives us the higher resolution.
What IS required in order to use a higher screen resolution is a more powerful processor (and/or an additional graphic chip as used by current high-end Pocket PCs (Dell, HP)) to update the screen fast enough. Of course the faster processor can also come handy for other applications such as multitasking, multimedia, Internet capabilities, etc.
Heck, I should also mention that the additional graphic chip that is used in some Pocket PCs allows users to reduce CPU clock speed to a minimum and still be capable to run full-length mpeg/divx movies (with a CPU below what would be required to run the same movies on a Tungsten T3 let's say).
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