Best Instant Messenger

Windows Live Messenger 2009 (14.0.8064)
Google Talk 1.0.0.104 Beta
Yahoo Messenger 9.0.0.2133
Skype 4.0.0.206
AIM 6.8.14.6
ICQ 6.5.1005
Digsby Beta (build 47)
Miranda 0.7.14
mIRC 6.35
Pidgin 2.5.4