Ping Pong (Table Tennis) Rules
International Table Tennis Federation - Laws
The rules according to the ITTF Handbook.
USA Table Tennis - Rules
The rules according to USATT.
About.com - Rules of the Game of Table Tennis
Rules similar to USATT and ITTF.
Also highlights specific aspects of the game.
As a bonus, here's the answer to a question I had.
(Answer is derived from USATT Stump the Ump.)
Q. What happens when Player A serves, and the ball hits the net, but lands on opposing Player B's side?
A. This is a "let". No point is scored for either player, and Player A serves again. This process can repeat an unlimited number of times.
Play Ping Pong (Opens in new window)
Only works in Internet Explorer 4 and above. When the game is open, press "Start". Use your mouse to move the paddle. A ball (asterisk) bounces off walls in a predictable pattern. Prevent the ball from "falling through." If the ball does fall through it will stop. Press "Start" to try again. You can also pause the game during play.