Windows Phone App Studio: kickstart your Windows app development

Microsoft promises: "Take your App from idea to Phone in record time".

The Windows Phone App Studio lets you swiftly build apps for immediate publishing, testing, and sharing with clients, co-workers, and focus groups. When you're ready to add advanced programming features, the Windows Phone App Studio generates your source code - a feature no other app-builder tool provides.

Read more: http://apps.windowsstore.com/default.htm