As you all know there are many Cool Live services from Microsoft, but for those who want to know about Windows Live Messenger or Spaces and how they can take advantage of these in their profession as a teacher, as a student or as a parent or as a IT professional, should check this site http://learning.live.com/
For learning about various features, be it of Windows Live Messenger or Windows Live Spaces, the site provides tutorials for learning in a easy way.
These tutorials help in using the Windows Live Messenger to best of its potential.
It can be in the form of pdfs such as Student How-to, Teacher How- to or Windows Live Messenger Product tour are provided.
This is also a site from msn UK designed in cool way. This can be very useful for beginners. I hope many such tutorials will be added for other Live Services in future.