The recent launch of Windows 8 brings a lot of new opportunities for both designers and developers to build beautiful apps that are fun and easy to use. This site is a collection of explanations of the most important aspects of the new Windows 8 design language.
A live tile is an app's representation on the Windows 8 start screen. It can be updated with new content even when the app isn't running, encouraging users to return to the app. But there are some common mistakes that are made when designing live tiles that you should be aware of.
Looks like a great design guide for a dev like me...look, pictures! :)