Windows Domain Server incorrect-password delay
One change to security for incorrect password entry that would make it friendlier for the users and more secure against brute force password attacks would be to use a geometrically increasing delay when a specific number of wrong passwords are entered. The first delay could be one minute, the second 5 minutes, the third 25 minutes, the fourth 125 minutes, etc. Of course this would also involve a time setting for resetting the wrong passwords progression after a previous delay. This would make the initial delay for wrong passwords very short for the user, but would increase the time for a brute force attack to guess the possible passwords from months to years.