I have been looking for strong game portals that support Silverlight. Which ones are currently available?
http://www.mashooo.com has quite a few Silverlight games.
GameJolt is pretty awesome!
http://www.silverarcade.com/ is dedicated to Silverlight only, that's the only one I'm aware of.
http://www.vectorlight.net/games.aspx has Silverlight and HTML5 games you can submit to.