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Dave, I made a 12V power supply for my 40D. Used a spare AC adapter as the others have recommended, used a 12V to whatever-40D-needed-but-can't-remember-volt power supply. It worked, but found it a bit flaky. I recall one night the camera just played up on me. Put batteries in and all good, so put it down to the power supply.
I know for my 5DII I'll be using the the genuine 240V AC adapter and a 12V to 240V inverter. I know it's less efficient in terms of converting DC to AC to DC again, but I think most 12V batteries would well and truly be enough for an all-nighter for a 5DII.
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