Links to Windows Phone 7 Design Tutorials

Metro Design Language of Windows Phone 7

Windows Phone 7: Starting to Design an Application

Design Tips and Tricks for Windows Phone 7

Layout Tips and Tricks of Windows Phone 7

Taking Advantage of Photoshop Templates

FXG Import and Workflow

Designing for Gestures on Windows Phone 7

Via MSDN Blogs.

You may also want to check out: Windows Phone 7 Tutorial Series : How to build & deploy WP7 applications | The Windows Club