More news: Palm Pre owners say the overclock is generally stable and are only noticing a small decrease in battery life:

http://www.engadget.com/2010/03/26/p...-enjoy-at-one/

However we don't know if the Pre's OS is as CPU-intensive as Maemo 5 (and the crazy stuff we do on it ) so it could just be that their CPUs are spending little time at max. power.