Since I was in need having 2 MSN Clients installed, I had a look and found a cute solution for that!
Having a 3rd Party MSN Client installed was boring none of the origin feat. worked well. (Miranda, Trillian, whatever)
Have a look: msgplus
You can customize mostly all features of Live Messenger, inkl. Custom Scripts in your Chat Window, Custom Text Colors, Transparency.
Just a short Intro for its massive additions.
Messenger is must for Nintex Lazy Approval or just for communication with Sharepoint.
Looks its written entirely in .Net