hmm, not so sure about the interface. Too pale now. The checkboxes have also lost their colour. I really hate the icon too...in my dock, the musical note(s) look off centre, as if they are shifted too far to the left.
As for Ping,i don't get it. I also don't like that it forces a full name rather than a nickname.
On the plus side, the error I was getting when checking for app updates is fixed. I would get an error every time I went to download a batch of a updates, telling me the information was out of date. Appareently this was due to having apps that are no longer available in the store.
Overall, I was hoping itunes 10 would bring less bloat. Instead, with Ping, it has brought more.