Can you use developer tools to slow down the CPU speed?

I'd like to slow down my MBP processor speeds when I'm just browsing the web and reading emails. Can you do this with the developer tools that you get with your MBP?
I know there is an app that does this called "CoolBook." Has anybody used it?
Mark

Well, you can do anything with the developer tools for OSX, but there is not tool like CoolBook. If you want to find the malloc holes in NeoOffice, install the developer tools. If you want to underclock your machine, use something else.
CoolBooks is probably a great idea (though I haven't used it). Just remember that the CPU is only part of the story and that screen brightness, airport, built-in ethernet, and peripherals play a big role in battery life. The elephant in the closet is also the GPU. I haven't ever seen anything about underclocking the GPU, but that thing takes up some serious juice as well.

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