http://people.uncw.edu/ertzbergerj/ppt_games.html
A variety of PowerPoint game templates a teacher could use with her class or students can play alone. There are also Word and Excel activities.
http://jc-schools.net/tutorials/PPT-games/
Wonderful site with PowerPoint free templates for Jeopardy, Who want to be a Millionaire, Concentration, 20 Questions and more.