I am very much interested in tuning and making the N900 faster. Both hardware and software methods. But saying that overclocking will damage the N900 with such certainty is a bit overboard. (although, I know what you are trying to say. )

Yeah, my phone even at 1GHz+ is sometimes very laggy and unresponsive when even trying to pick up an incoming call. (But I have to say, my N900 is not exactly "stock")