(I don't think this really belongs in the game forums, but feel free to move it if you do)
Help me get through the dullest week at work ever...http://www.chessatwork.com
Browser based chess, play multiple games at once (max of 6 unless registered), you take a turn and it sends your opponent an email... when he takes his turn, you get an email. Nice way to play if you don't like the pressure of a timed game at yahoo.
Free registration required to play. If you are afraid of spam give me your email and I will send you an invite for a google mail account you can use just to be safe.
If anyone is interested, register and send a challenge to "coopasonic"!