Read original post by Antti Makkonen at AnttiTech Blog
I recently started playing with around with Windows Phone 7 devkit and found it to be surprisingly productive tool set. I managed to develop a simple app within couple of weekends with almost zero previous knowledge on WP7 programming. I learned a couple of things on the way and wanted to tell them to you.
What I did was I started with installing Expression Blend, Visual Studio 2010 and WP7 SDK. I made UI using Blend and did the coding with Visual Studio. Benefits of this were near WYSIWYG experience with WP7 UI and no broken XAML during development.