Have read up on oc'ing in NITdroid and it turns out when NITdroid is installed it has a stock clocking at 700mhz at the moment. So a slight overclocking is there by default. It's changeble if wanted. Info on the subjekt on - http:/forum.nitdroid.com/ - Just look for overclocking guide by jay-c

It shouldn't do any oc'ing to maemo at all on install unless you allso download this file and install it: apt-get install kernel-power-bootimg :and have titans power kernel installed aswell