John Pozadzides has put together a great post about how he'd hack weak passwords, particularly passwords that could unlock one, or all, of the logins you use online. He put together this list so that you can understand how a hacker would approach cracking your password - and how you can prevent yourself from being the next target!
John's top 10 list of password attempts are:
These password attempts will probably capture 20% of all internet users. His post continues with processes that would help him grab the rest of them - things like hacking online forums where you probably use the same password you do for your bank - but who are easier to hack, of course, than a bank! I bet that's not something you considered when you used the same password.