Five Minute Video on Focus-Boosting Pomodoro Technique
youtube.com
youtube.com
I checked out all of the desktop timers listed here: http://www.pomodorotechnique.com/fans.html#pomodorosoftware. I think that the best one (for windows) is focus booster http://www.focusboosterapp.com/, which is also available online: http://www.focusboosterapp.com/