You've never seen Pong like this!
 

The game is called Plasma Pong. It is definitely not your standard Pong. The graphics are really colorful and... fluid. The game is free, too.

http://www.plasmapong.com/

It was originally featured in a Wired News article for the best indie games of 2007. Here's the article if anyone's interested.

http://www.wired.com/news/columns/0,...l?tw=rss.index