Too Many Passwords

Anyone out there have too many passwords? I believe that there should be an absolute limit to passwords, say 10. That's the maximum that we all need to remember. I mean, you start counting up your own user names and passwords -- it's shocking. I need to know how to get on this site... into my several bank accounts... into my boyfriend's bank accounts... my multiple email accounts... my favourite websites... and on and on and on... I know that I could just use the same username and password, but that is FAR too logical. And my passwords keep changing over time. It'