#Dropbox - #Password strength is indicated by colored bars underneath the input field
Password-Strength is a jQuery based password strength checker and indicator that helps users meet your minimum password requirements.
Is your password secure?
xkcd: Password Strength
Beanstalk - The password strength indicator shows you the amount...
8 Best jQuery Password/Strength Meter Plugins | SmashingApps.com
Beanstalk - The password strength indicator shows you the amount of hours needed to crack it.
How Your Passwords Are Stored on the Internet (and When Your Password Strength Doesn't Matter) -- LifeHacker, June 20, 2012
Meters grading the strength of passwords had a measurable impact in helping users pick stronger passcodes
Password strength verification with jQuery: http://www.webdesignerdepot.com/2012/01/password-strength-verification-with-jquery/