Windows Phone Thoughts: You Have The Tools, Now Here's The Style

"With the Windows Phone Developer Tools in Beta and Windows Phone 7 in ,now is the time for you to build Windows Phone 7 apps in earnest. We have refreshed our developer documentation to help you build those apps, and we have two, new design-focused documents to help you make them look beautiful. First up, the UI Design and Interaction Guide for Windows Phone 7 v2.0 has been updated from the ground up for beta. With additional information and a new layout we hope you will find more readable, this guide provides detailed information about UI elements and controls, UI system behaviors, and the interaction model for the touch interface based on the design system internally named Metro. Designers and developers should read this guide to learn about the dos and don'ts of UI implementations for their Windows Phone apps. We've made it easier to find specific guidance by putting it in bold in the right-hand column of each page."

Style guidelines and more are now available to developers looking to not only write great apps, but make them look halfway decent as well. For all the docs, hit up Microsoft's site. If you want a really nice indepth review of the UI Design, take a look at this excellent piece from WMExperts!