With Darn! Passwords! Just one password opens the safe that holds all those other ones for programs and web sites that require you to log in. Download Here.
Just pick the password, and drag it and it's log-in (if there is one) into the program that uses it. No retyping is necessary (even in programs that do not accept the drag, you can just paste the password in). Go to the URL of a password protected site with the click of a button.