for overclock with nitdroid installed : (if you had overclocked before nitdroid install)
root
apt-get install kernel-power kernel-power-flasher
apt-get install kernel-power-bootimg kernel-power-modules
but this works only if you have multiboot installed
The easiest way is to understand what you are doing. You should scan the information available in the Wiki at wiki.maemo.org. The topic is Overclocking.
I have installed power kernal and QCPUfreq and it only allows me to over clock to 850 any higher and it reboots. So is that the limit of my device or is there another way i can overclock higher. Have seem on borads that lots of people can oc to 1gig or even higher.