Microsoft released Silverlight 1.0 today, announced plans to work with Novell to bring Silverlight support to Linux. They have some customer showcase sites, like the Home Shopping Network and the World Wrestling Entertainment group, though these two sites are not RIAs, they're only using the Silverlight plugin to stream video.

Beet.tv has more information, including an interview with Brian Goldfarb, head of development for Silverlight. Ironically, that video is posted in Flash video format.