Saving power with Linux on Intel hardware
Intel is releasing PowerTOP, a tool that helps you find what software is using the most power. By fixing (or closing) these applications or processes, you can immediately see the power savings in the tool. You’ll also see the estimated time left for battery power if you are running a laptop.
Regarding fixing the application, Intel already offers > 20 tips and tricks for Xorg, kernel, GAIM, Firefox, Evolution, dhcdbd, ntp, ibm_acpi, mixer_applet2, gvim, xterm, …
The testimonials sound impressive. So if you are not afraid of building your own kernel and patching a few apps, give it a try.