Temporary password

Say you want to read your email.  But you are at an internet café and the paranoid version of you wonders if there is a keylogger on the machine.

Wouldn’t it be nice to get a temporary password.

Say you use gmail.  So you open your phone.  Surf to temppwd.google.com and log in as you usually do.  Back you get a temp password that is valid for 1 minute.
Now surf to gmail at the café computer and use your temp password.

A variant of this is to have your tablet at home logging in to your email and then change the password at work. The tablet keeps logging in with the old password and your account gets locked.

This happened to me with my VPN connection and secureid.

Maybe a solution is to have several usr (probably with different pwd) to the same account. For instance a usr for public machines which you can lock without affecting you other pwds you use at work or home.