We're just in a session on design practices in Windows 7. Microsoft just demonstrated a usability test where a user hovered over the new taskbar and was impressed so much they just continued playing around with it.
Check it out below:
Next up a design concept for jump lists was shown, an old version that is not going to be shipping was shown from old Win 7 builds:
I am posting this as live as possible so I will add more concepts as they demonstrate them.