OK.
A quick overview of the new stuffs.
1. You are able to sign in to MSN on multiple computers.
Notice the 2 places at the top? That's the new multiple
sign-ins. Present since private beta.
2. See the Favourites? Again, new. Favourites, like its name, is
all favourite stuffs at one place.
3. See the top. Whereas previously the most one could change is
the colour, you could now use background. Microsoft calls it Scene.
Mouse over to the top right hand corner of the background, you will
see a brush. Click on that to change the background.
4. Animated avatar. There are a couple of animated avatars in
the options which you can select. I'm using the shooting stars.
Screenshot can't show it. Hehe
5. What's New at the bottom. Basically tells you what your
contacts have been doing. Post a note seems quite useless for now.
Can't get it working.
6. PhotoIM. No idea what is that. MSN help is useless, but I
suspect it's related to sharing photos.
7. Signature Sound. As it is named. Something that will identify
you.
8. Groups and categories. It's like folders and files.
Groups = folders in Windows
Categories = sub folders
Contacts = files
For neat freaks, me thinks. 
Example:
Group - Friend
Category 1 - Primary
Category 2 - Secondary
Category 3 - Poly
Category 4 - Uni
Things that have changed.
1. Viewing of contacts. What's wrong with viewing contacts by
their email address? 
2. Number of status. Reduced by quite a bit. Following Yahoo
Messenger, lesser is better. But unlike Yahoo Messenger, it lacks
the ability to add more statuses.
3. Messenger icon near the clock. One word - UGLY.
Screenshot from Vista. See the difference between XP and Vista.
Vista picture is clearer, font is clearer.
