We've already seen a few examples of how Microsoft is continuing to change the UI in Windows Phone 7 (see here and here) and now Paul Thurrott has documented even more.

Probably the most interesting are the changes to the main Start screen as seen above with the February version to the left and the newer "TechED" version on the right. Basically some of the tiles have shrunk, the mail tile became more specific by denoting an Outlook icon and Marketplace has taken front stage as it should.

Thurrott goes through some other minor changes as well as discussing his experience with the OS from a few months ago. As always, a good read.