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It's worth trying to conserve energy at the laptop too if you can. Keep screen dim, avoid using DVD player if you have one. A script or utility to completely blank the screen can help too.
I've got an Acer that's a few years old that draws about 2.6amps screen fully lit, 2.2 full dim, 2.0amps darkened. All adds up over a couple of 8-10hr nights. Little netbooks are nice, but I've seen a couple of people stuggle to run the applications they want to (and how they want to) on the smaller screen.
I'm sure I've read here before the 240V invertors are nowhere near as efficient as 12V/19V units you can buy as Marke mentioned - I tape mine to make sure it stays on the right voltage and to cover up the bright red LED.
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