The following link shows a password generator I built that, like the title says, is driven by AJAX (meaning; you just type in the length you would like the password and it creates it with-out any wait-time). The passwords are generated by a specially made PHP Class I built that generates passwords 4x faster than most password generators. The max length is set to 64 characters. That should be enough. Might add some more functionality later. But keeping it simple is important.
Click here for the password generator