What is the correct procedure to get going again if your N800 develops a terminal software problem? If I plug the USB into to my PC and then hit the On button, I see something about firmware update mode - is that a reliable way to restore the unit to initial condition even if it's completely screwed up?

No terminal problems yet, but I'm a bit paranoid with all the experimental software I'm installing, and I haven't even tried any kernel hacks yet.