Messanger

Depends on what your friends are using I supposed....coz most of the IM are not multi-platform... Trillian is great because it is an integration of 3 different messengers - AIM/ICQ, MSN and Yahoo...and it can also log on to mIRC too... Skype isn't too bad as you can purchase credits to make VoIP-to-phone calls....but the adoption rate is not as high

The main ones seem to be MSN, Yahoo and Skype. I have all three, but am usually too tired to log in!