I thought this neato web application was worthy of mention. It is called the Password Meter and it rates the strength of any password you can think of. It is surprisingly in-depth, however, providing each criteria and rate that makes up part of the percentage.

I know our resident mathematicians here will enjoy it; you know who you are.

Anyway, I got a 56%, which startled me. My password has letters, numbers, and spaces. Another one can be found here; I got an 86%, so I can quit crying.