In a little tidbit that you can't find anywhere else online, Scoble let slip that there won't be a sidebar in Longhorn. Later in the same thread, Scoble talks about how this is generally a good thing due to the screen real-estate the sidebar was taking up.
This is huge - for the sidebar was one of the big things shown off at the PDC (and even had Rory writing small sidebar tiles).
I'm not sure I agree on the real-estate argument. I've set up my taskbar on the right side of the screen due to the quick access it gives me to stuff on the quick launch bar. I'm sure running MSN on the sidebar would have been killer.
Longhorn is just around the corner and there is a sense of excitement in the air in Microsoft circles. To quote Sean Alexander
"..I'm getting that old feeling again. Like that first early morning when you can smell Spring in the air....And the more I talk to folks on the Longhorn team, the old excitement about shipping great software is back... "