Every password you have is important. Every one. Here's a great article from PC Magazine on how to make your passwords uncrackable.

We live in a password-driven world, where between four and 20 characters are the difference makers in whether you're able to access your data, communicate with friends, or make your online purchases. The problem is that passwords should be different everywhere you use them, and that can make it difficult to remember them all. And, if a password is truly strong, that makes it even more difficult. Follow these tips and tricks to take total control of your terms for access.