Are you blind?? There are thousands of great Silverlight applications out there both for the Web, Desktop and Phone.
Take Sky Player as a good example, how many people do you think use that?? If that’s not a great example of an SL app I don’t know what is… Then we have most of the Windows Phone apps that use Silverlight… Then on top of that we have the much more commercial applications, some of which were demonstrated in the keynote video on this article.
I have a feeling you’re one of those people that thinks Silverlight was intended as a replacement for Flash, lol :-)