The Windows Phone Developer Tools includes the following
- Visual Studio 2010 Express for Windows Phone
- Windows Phone Emulator Resources
- Silverlight 4 Tools For Visual Studio
- XNA Game Studio 4.0
- Microsoft Expression Blend for Windows Phone
Download – http://www.microsoft.com/downloads/en/details.aspx?FamilyID=04704acf-a63a-4f97-952c-8b51b34b00ce