It would be nice if Fedora (or possible Extras) supported one-time passwords. I'd like to be able to log in to my Fedora machine by ssh from Internet cafes, but suspect that the average machine in a cafe has keystroke loggers. OTPWs would mean that the sniffed password isn't good for a second try.
This is a perfect candidate for a new Fedora Extras package (pam_otpw). If you submit it I'm willing to review it.