Play an internet chess game

Internet Chess Games have quickly become the way to get a challenging chess opponent when you have reached a level where you beat all your friends. It's fun and It's becoming far less expensive than calling up a friend and driving to the park or coffee shop for a game of chess, what with the current gas prices and all.
I always know where I can find a challenging game of chess when I want it. Here is a list of links to the very best Internet chess game site's.

Great Online Chess Community!:
www.gameknot.com

Can always be sure of a challenging game of chess!:
www.instantchess.com

Home of the Fritz Software:
www.playchess.com

My favorite Internet chess gaming site:
http://www.chessclub.com/

Internet Correspondence chess
www.redhotpawn.com