iPhone-Like Password Masking With MooTools: PassShark
PassShark is a MooTools class for masking password fields similar to iPhone: showing the last typed character for a while & masking it later.
It is an install-then-forget solution as after inserting the passshark.js file into your website, the class will be finding the password fields automatically & applying the masking.
PassShark has few option like defining the "interval it checks for the newly enteres characters" or "the character inputs are replaced with".
It is an unobtrusive class & works in all major browsers.