Silverlight integration is already included in SharePoint 2010 – when you try to create a new list, library, discussion board or a simple page  without Silverlight installed  you will find the traditional SharePoint Create page.

However with Silverlight installed, you will have a richer feature set with options to filter, categorize and even to configure the settings:

Silverlight applications can be embedded with SharePoint 2010 in serveral ways:

• SharePoint 2010 Service integration with Silverlight
• Client object model with Silverlight
• Rendering data with Silverlight
• REST services with Silverlight

SharePoint 2010 Service integration with Silverlight – SharePoint 2010 has numerous built-in web services. You can also create your own web service and use a Silverlight application to implement this service. Generally asynchronous execution is required and the results are retrieved in xml form and then parsed.

Client object model with Silverlight – The Silverlight client object model uses asynchronous query execution so that delegates for callback methods are passed as parameters in the ExecuteQueryASync method.  If you wish to use the Silverlight object model, create a Silverlight application in Visual Studio, then open the default Page.xaml.cs file and add code in the page class. Build the project and upload it as .xap package to a document library. Finally, add the Silverlight web part to the site page and then point the URL of the Web Part to the .xap file that you uploaded to the document library.

Rendering data with Silverlight – Data can be rendered with Silverlight by passing initiation parameters through the init params method of Silverlight.

REST services with Silverlight – REST services help create strongly typed object sin SharePoint using OOP and ATOM.