dont know about everyone else.... but I dont like msn/skype sticking about in the task-bar after its minimised to tray....
just found an easy fix
32bit: C:\Program Files\Windows Live\Messenger
64bit: C:\Program Files (x86)\Windows Live\Messenger
there, look for msnmsgr.exe, right click, go to properties. In the compatibility tab, select Windows Vista as the operating system for compatibility and when you next open messenger it should minimize to the tray.
same thing worked for skype too :-)