Beyond LastPass and such, one long-standing UX implementation is in Mac OS X, when you go to change a user's password. It even has an interesting dialog box, th

Beyond LastPass and such, one long-standing UX implementation is in Mac OS X, when you go to change a user's password. It even has an interesting dialog box, though the pre-selected passwords tend not to be quite random enough for my tastes if pronounceable. A variation of this has appeared in Safari on iOS 7 with iCloud Keychain turned on: Safari will now suggest a password in the autocomplete when you go to fill in a registration form it can recognize. This, while surprising, really does work assuming someone can "save" the password at the same time. (Hence why it's rarely done on the web unless you have such tools, but people more often do these days.)