How much does the screen brightness matter?

I love my new Macbook, especially the beautiful screen. I find myself worrying about battery life, even though I know I shouldn't. I keep the screen at half brightness on battery, and 3 settings higher when it's plugged in. It looks nice, but I'd love to run the book on full brightness. How much does this affect the battery? Will half brightness really save me 20...30...40 minutes? Has anyone run any tests to see battery life at different brightness settings?
Macbook 2ghz, The White Kind...   Mac OS X (10.4.6)  

Yes, one of the biggest consumers of power within your MacBook is the display. Why don't you find out for yourself what sort of differnce it makes given that experiences do differ. If you prefer to use your display at full brightness then do so. It is yours!

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