Silverlight 4 links…

WEBSITES

Sharker Khaleed Mahmud Silverlight Tips & Tricks
http://silverlightips.net/

CONTROLS

Silverlight Toolkit (Official)
http://silverlight.codeplex.com/

PivotViewer Control for Silverlight
http://www.silverlight.net/learn/pivotviewer/

Blog entry – 3rd Party Silverlight Control Roundup
http://timheuer.com/blog/archive/2009/01/28/comprehensive-list-of-silverlight-controls.aspx

APPLICATIONS

Microsoft Silverlight 4 Client for Facebook
http://www.silverlight.net/community/samples/silverlight-4/microsoft-silverlight-4-beta-client-for-facebook/

DOCUMENTATION

Silverlight 4 Documentation
http://msdn.microsoft.com/en-us/library/cc838158(VS.95).aspx

Get Started
http://www.silverlight.net/getstarted/

Silverlight 4 Videos
http://www.silverlight.net/learn/videos/silverlight-4-videos/

Silverlight 4 Hands On Labs
http://www.silverlight.net/learn/handsonlabs/