In order to add a Silverlight application to Sharepoint web page we need to add a content editor web part and insert HTML object tag with appropriate properties. In order to make this process easier we have developed a Silverlight Loader webpart. This webpart will take in the Silverlight 2.0 application file (XAP) file path and loads the Silverlight application within the Sharepoint page. The webpart along with installation instructions can be downloaded from here

Silverlight Loader webpart