So at my current job, I have to keep track of a LOT of passwords, the rules for picking a password are pretty complex, AND we are not allowed to use a password more then once. Plus we have to keep our passwords changed at least once every 45 days. I call it a "password change day" because it is conveniently one day after I just became able to remember my password without having to look it up! Recently, our company recommended a free tool called "Password Safe" (http://passwordsafe.sourceforge.net/) I have only been using it for about 4 days now, but this program is simply AMAZING. And I highly recommend it for keeping track of all your online passwords.