NeoPlanet
I downloaded MSN 6 a couple of days ago. It is a nice interface but I wound up uninstalling because of the way it wanted to take over everything. I figured that if I didn't like what I could see, I would hate the things I couldn't see.
If you like the MSN browser, taker a look at NeoPlanet. It is a browser that works with IE and give you a different look and some decent features. No banner ads etc. It is a clean application imo.
NeoPlanet