Did you know that you can Develop Windows Phone 7 Apps for FREE?
Download and Install :
1. Windows 8 Release Preview (Free)
2. Games for Windows Live (Free)
3. Windows Phone 7.1 (Mango) SDK (Free) *
4. Windows Phone 7.1.1 (Tango) Update (Free)
* Mango Software Development Kit (SDK) comes with Visual Studio 2010 Express (Free)