Anote su clave secreta

La última recomendación en cuanto a passwords. Lo importante aquí es
que es mejor tener un password complicado anotado en un papelito que
guardemos bien (igual que guardamos la cédula o tarjetas de crédito),
que tener un password fácil de recordar (y por lo tanto fácil de averiguar).

Si van a usar este sistema (anotar sus passwords) yo les recomiendo
usar un nivel adicional de seguridad al anotarlas (por ejemplo, agregar
tres letras ó numeros adicionales al principio o fin de cada password).
Así, si alguien se consigue el papelito no tiene como saber cual es el
password real. (No usen los mismos tres números para cada password!).

Saludos!

Del website de Bruce Schneier:

Write Down Your Password

Last month, Microsoft’s Jesper Johansson made the news when he urged people to write down their passwords. This is good advice, and I’ve been saying it for years.

Simply, people can no longer remember passwords good enough to reliably
defend against dictionary attacks, and are much more secure if they choose
a password too complicated to remember and then write it down. We’re all
good at securing small pieces of paper. I recommend that people write
their valuable passwords down on a small piece of paper, and keep it with
their other valuable small pieces of paper: in their wallet. Obscure it
somehow if you want added security: write “bank” instead of the URL of your
bank, transpose some of the characters, leave off your userid. This will
give you a little bit of time if you lose your wallet and have to change
your passwords. But even if you don’t do any of this, writing down your
impossible-to-memorize password is more secure than making your password easy to memorize.

Link to Microsoft article

or

TinyURL link.

Or you can use PasswordSafe.