Sign up at http://chessmaniac.com .
We could start a mapcore team or something. It's quite fun. You can have multiple games going at once, with different time limits. It's quite amazing. Currently there are over 300 users on, so it seems to be a popular site.
My username is 'MattYoung'. Throw me a challenge!
EDIT: Don't know how to play? Learn! http://www.princeton.edu/~jedwards/cif/intro.html
I just started playing today, it's great fun!