Fresh from his new viewer presentation at SLCC (video of that here), Chief Product Officer T. Linden recently announced the LLMedia API, for third party developers interested in creating plug-ins to display rich media in Second Life (besides Quicktime, the only major format available in SL for the last several years.) Here's the feature's geek-heavy wiki page. The most desired media plug-ins (at least cited by the Lindens) would be for Office Documents, PDF, Java, Microsoft(R) Windows Media(R) Audio and Video, Ogg Vorbis, DivX. (A plug-in for Adobe Flash is not mentioned, which is strange, because it's a universal web feature, and T. Linden is an Adobe alum, but perhaps there is a compatibility issue.) Any case, I put the question to my developer readers: What would you like to do with this API?
Update, 2:15pm: To help fire the imagination, via Qarl Linden, here's a suave demo video by Aimee Trescothick of the API in action.