Well, I need to keep track of 28 different passwords for various machines, so my practice is to keep this info contained in a file on an electronic organiser (that has yet another password!) I have never shared the organiser password with anyone, nor do I allow anyone to handle the thing, so that is the one password that I never change. Any time I update a password elsewhere I update the organiser, and I am good to go. I realise there must be more secure methods, but what the hell, it works for me.