Silverlight is Argentum in a Flash
Download Silverlight for Windows here and Silverlight for Mac here. It's only a meg and is harmless.
Be sure to check out Alexy's blog post (via Mike Harsh where I stole the Silverlight Logo) with his WPF/e (Silverlight) 3D demo based on his Bubblemark 2D Benchmark that includes:
- XBAP (XAML Browser Application)
- Apollo Flex and Apollo HTML (requires Adobe Apollo)
ASIDE: On an unrelated note, if you ever wanted to get Windows Media working in FireFox, download the WMP Plugin for FireFox and you'll be on your merry way.