This whole thread is pervaded with FUD. There's a big official overclocking thread. Any real problems should have been reported there, and they really haven't been. There aren't any real problems. Well, maybe the battery could die early. The real solution is to have a few extra batteries anyway -- that's handy for several reasons not having anything to do with overclocking, like lots of people have gotten into situations with N900s that seem dead and they sent them back to Nokia, only to find that the only problem was a dead battery, which they could have determined in ten seconds if they had a spare.