Though a class Novice I still like to play correspondence chess via the net. I like correspondence chess for the freedom that it gives a person as you only have to devote at most 5 mins a day to it.
The good thing about www.ItsYourTurn.com is that all the rendering is in html. Nothing fancier than that. This means that you can access this site from a bare-bones system from an archaic era and still be able to play. Quite useful at times!!!
In addition to different variants of chess this site has other games like backgammon, draughts,battleship, Othello, Go etc. It also has some unique games like Jamble (somewhat like Scrabble). Check out all the games that they have here.
I will put up similar posts for the other sites I visit for chess.