You probably know that Designing Worlds did an interview show with the Lindens about SSA and Materials. You can see the video of the show on YouTube (also below). If you have been following this blog, there is nothing new in the video.
You can get a copy of the Materials Project Viewer (see the left column) and see how things are going by visiting Hippo Hollow. I suggest you set the Sun to midnight.
They have a number of examples of things with normal and specular maps. Above them they have lights rotating so you can see the effect.
I think this is a live testing area and will likely change. You may notice some of the items shown in the video are in the test area.