I love the notification system, it works great

But a hub for all notifications is still necessary. Unless there is one I haven't found yet... also I find the messaging application to be EXTREMELY unreliable. It randomly disconnects and then won't reconnect, or it says people are online which clearly means I am if it could load the contacts, then says "Sign in to send a message". Grr.
I also miss contact linking in the people hub. It'd be great if microsoft made a new standard of contacts, one made after linking contact accounts such as facebook, gmail, windows live.