I am using 6 and the only difference I have found is that when I go to download a media(audio/video) a built in media player in IE offers to play them, it comes up in a split screen, sort of like the search or history on IE 5. When I try to go into FTP sites now through the browser I am told I have to download someother software, no matter what my response, the program shuts down.
So no i'm not overly impressed as of yet.