Chris Bennett commented, "While the developer tools make it very easy to develop applications, this device is a complete departure from prior versions of Windows Mobile. And as such, many of the applications and techniques used on prior versions do not apply."
If you haven't seen a preview of Windows Phone 7 Series in action, and you are doing mobile development, you should. I commented about the phone in my previous blog entry. Additionally, Chris Bennett has now created an introductory article that shows you Microsoft Visual Studio Express for Windows Phone. While I'm currently using XNA Creator Studio to target the Zune device and eventually the Windows Phone, this Express Edition is more likely the right way to get started. You can check out Chris's article at the following link: