Well, I'm loving the new dash. It's easy to navigate and breaks down each sub-category quite nicely. The extra notifications are a handy touch, as well. For example, if a friend signs in whilst I'm playing a game, it'll tell me if they start playing the same game. This saves needless game invitations to those who are logging on to watch a movie, listen to music, or to play a different game.
Zune looks awesome and my first impressions of the LOVEFilm app are very high compared to the Playstation version. No more lagging and constant crashing! Yipee! Also, the menu and layout is far better.
I'm still waiting for the day Zune can sync with the Windows Phone library/playlists. That's a must, IMO.