Trillian is a good messenger since for two reasons, 1. It ain't a memory hog like some messengers. 2.You can be logged on in many Email accounts at once(not if they are the same such as yahoo and yahoo)
This is the summary from CNet a.k.a. download.com. Here is their summary
"Trillian is a fully featured, stand-alone, skinnable chat client that supports AIM, ICQ, MSN, Yahoo Messenger, and IRC. It provides capabilities not possible with original network clients, while supporting standard features such as audio chat, file transfers, group chats, chat rooms, buddy icons, multiple simultaneous connections to the same network, server-side contact importing, typing notification, direct connection (AIM), proxy support, encrypted messaging (AIM/ICQ), SMS support, tabbed chatting, system-tray notifications and alerts, and privacy settings."
Just thought it might be usefull for some people.

but MSN just so troublesome sometimes, especially Key Port and Host File