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