This article sorts out common Windows Phone 7 Resources for your convenience.
I will update the resources frequently in the future. If you have good resources, please leave a message and I will edit it in this article.
1. Download Tool
Online installation package
Offline installation package (recommended)
2. Official Microsoft documents
Msdn Windows Phone Homepage
Microsoft Windows Phone Portal
Microsoft Windows Phone home
Windows Phone newsroom
Windows phoen team blog
Silverlight for Windows Phone
Expression blend 4 for Windows Phone
Windows Phone developer website
Msdn online help documentation
Windows Phone 7 developer training package
Sample Code
Windows Phone 7 Jump Start video tutorial (English)
Inside Windows Phone video tutorial (English)
Microsoft Silverlight 4 offline document (Simplified Chinese)
Microsoft Silverlight 4 online help documentation (msdn) (Simplified Chinese)
3. Forum
Msdn Windows Phone 7 Forum (English)
Msdn windows mobile device Forum (Chinese)
Csdn Windows Mobile Forum
Wpmind Forum
4. Common WP7 sites
Wpmind
WP7 fans
! FANR live
Codeplex Windows Phone 7
Windows Phone 7-codeproject