Linden just updated their Second Life blog with details on the new SL Viewer application, releasing it in beta.  The application itself is impressive, but then they let this little morsel slip:

Shared Media™, a standard capability in Viewer 2, makes sharing standard Web-based media and content in Second Life easy, and enables content creators to make more compelling, interactive experiences. Content creators can now place Web pages, video, Flash content, and other web media, onto any surface in Second Life. We expect that Shared Media will inspire a creative renaissance in Second Life as Residents explore more immersive and integrated inworld experiences and business opportunities such as gaming or theaters. And, for enterprises using Second Life as a work environment, Shared Media allows everyone to more effectively collaborate and share documents.

So it sounds like now you can independently map interactive web content onto each side of a Prim.  Should be interested to see what new uses this brings inworld.

via Second Life Blogs: Features: Second Life Viewer 2 Beta, Now Available.