According to a study at Georgia Tech Research Institute, your password should be at least 12 random characters long (and include letters, numbers and symbols) if you want to consider yourself safe from brute force password hacks.
From MSNBC: "'Eight-character passwords are inadequate now ... If eight characters is all you use, and if you restrict your characters to only alphabetic letters, it can be cracked in minutes,' said Richard Boyd, a senior researcher at GTRI."
We've highlighted how easily common passwords can be hacked, but even if you've got a system auto-generating your passwords, you may want to make sure you're going for at least 12. [MSNBC via @wjrothman]