The Windows Phone 7 Developer Tools package includes
everything you need to write awesome applications and games for Windows Phone
7. All of the tools included in it are absolutely free.
The following is installed with the download:
Visual Studio 2010 Express for Windows Phone – Free edition
of VS 2010 for Phone development.
Express Blend 4 for Windows Phone – Free version of Blend
for Windows Phone 7 Development.
Silverlight for Windows Phone 7 – Rich framework for
building great applications for Windows Phone 7.
XNA Game Studio for Windows Phone 7 – Rich framework
that enables you to build great 2D and 3D games for Windows Phone 7.
Windows Phone Emulator – A hardware accelerated emulator
that allows you to run and debug your applications and games without requiring
Phone Registration Tool – When you get a device, this allows
you to “unlock” the device so you can run/debug your application on it, using your Marketplace account.
All of the above tools and frameworks are packaged into one
setup, and everything is free. If you already have Visual Studio 2010,
the setup will also add support for Windows Phone 7 development and projects to
your full Visual Studio 2010.
Applications and games you build with the tools released
today can be uploaded to the Windows Phone Marketplace - which enables any
phone consumer to easily download and purchase them directly from their
phone. This provides a great way to distribute applications/games that
you either get paid for or distribute for free.