I've integrated the Vertigo Silverlight player into mojoPortal in the Image Gallery feature and created a new Flickr Slideshow feature as well.
Its on demo.mojoportal.com now. the Flickr part is hard to demo because it requires a Flickr username and api key. It works on my local machine but I'm not going to enter my credentials into the module settings on a public demo.
If you use the regular Image Gallery Feature and upload some images then go to the feature instance settings and enable the Silverlight Slide Show you can see it. I must say it is pretty sweet! But the Silverlight pugin is not yet as ubiquitous as I would like.
Anyway, its a really nice user experience with Silverlight enabled.