For things that I use on a regular basis (BlackBerry, Flyertalk, Amazon etc.) I just remember them but for things that I don't, I use my Blackberry. I just look up the contact for that firm/site and work out what the password was in the details there, the things encrypted (and lock after a minute, so there is little chance of someone finding it and using the data. I may be overly cautious in not just storing some passwords directly on the Blackberry and putting them in buried in other data but it works for my piece of mind.