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Edit: to post above-
They are referring to kernels, which control the speed of the cpu.
Link:
http://androidforums.com/all-things-root-droid/98988-froyo-kernels.html
Install them like a rom. Download one from the link above (I use chevy 1.1 ultra-low volt[ulv]). Go to rom manager, hit "install rom from sd", find the .zip, leave both options (clear cache & backup rom) unchecked. Your droid will reboot into recovery and install the new kernel. Hit the option to reboot once its finished.
Once your droid starts up download setcpu or overclock widget. I use overclock widget (it's free). Add OCW to your home screen then hit advanced. Press "detect frequencies" after that set the max and min speeds you want the cpu to operate at. For screen off I have mine a 250 mhz min and max to save battery. For screen on I have 550 min and 1100 max for speed. OCing your droid makes a noticeable difference when multitasking, browsing the web with multiple tabs, and gaming.