For those on the cutting edge of Linux multimedia functionality, Miguel de Icaza just announced that a preview of Moonlight 2.0 is now available. Moonlight is an open source implementation of Microsoft's Silverlight for Linux that was announced in September 2007.
Go here to read Miguel's comments and download the source code, release notes and more.
Who is responsible for http://www.moreinterop.com? It's been down for over a week.