Hamlet has an interesting article up today: New Singularity Viewer Lets SL Creators Convert & Export Their Prim-Based Works to Unity 3D & Other Top Platforms. Hamlet explains why this is such an important aspect of Second Life™. Hamlet links to the article explaining how to do the export from SL to Unity 3D.
I am obviously not paying enough attention to Singularity. I like the viewer but care little for the user interface, V1 style. But, this export feature makes Singularity a must have for advanced users in SL.
Hamlet is excited about the advantage this offers educational institutions.