MSN messenger (if you hav not already got it) is a great way to know who is online, that way you dont need to organise a game in advance. When you sign in all other people who are online and have signed in come up on the screen. It is a great way for geeting a game going, More contacts you have more chance of people being online. Its free aswell any one interested go to
http://www.msn.com and download it anyone who has already got it contact me