One cool feature that Silverlight 4 supports is the ability to display HTML content, a feature that was not supported in previous versions of Silverlight. You can enable this feature by utilizing the new WebBrowser control and have it point to the appropriate HTML content. The WebBrowser control currently only works in Silverlight OOB (Out of Browser mode).
I made a fun demo that allows users to search and view Youtube contents in Silverlight. This is a cool concept because it also shows that the WebBrowser can indirectly support bringing Flash into Silverlight. The Youtube Demo takes input from the user to either search for the videos or get the videos from a standard feed (most popular, recently viewed..etc). The user can then select from the list videos in Default View (listbox) or Slide View (custom navigation). The Youtube video embed string to sent to the WebBrowser control’s NavigateToString method to render out the video.
Demo: http://www.silverlighttoys.com/Samples/SL4/SLYoutube/
Tags: samples, silverlight 4, youtube