As we see in this full features rundown clip, the Windows Phone 7 interface is filled with simple, beautiful animations not so dissimilar to the Zune HD.
Here's more video showing us the experience of maps and web browsing. Very sharp.
One last video from Recombu - here we see a giant Windows 7 Series mock-up running the interface in real time. It probably offers the best feel of general navigation we've seen yet.