Basically i have 2 main passwords that i use at the moment. I'll probably go crazy trying to remember them all if i use different passwords from every accounts i have. I can only imagine the frustration i get every time i can't remember one. I have a main password that i only use for my main email account and to some money-involving websites and then i have another main password that i use for social networking accounts, forums and other not-so-important websites. I change my passwords from time to time.