Our clan uses a (free) program called x-fire to message and use voice
communication with each other during games. X-fire is a far more
superior instant message client than any other because it allows you to
send and receive messages while you are playing your game, so there is
no more need for minimizing your game just to talk to other people.
X-fire also keeps a daily log of how many hours you play your games and
it lets you know what server your friends are playing on, and lets you
join the server they are playing on directly.
It is required, and it is highly recommended that every member in
the clan have a x-fire. If you wish to download x-fire, please visit http://www.xfire.com/download/