In several of the projects we are working on for our clients at the moment we are embedding video content into the 3D Virtual Environment.
Today I came across this video demo of an interactive video from a company called Yellowbird in the Netherlands. While Google street view offers a similar experience the key difference with this tool is that it is a streaming video rather than stills that are laced together within an interactive viewer.
We look forward to having video content like this being more freely available. It will make the environments we create for our clients that much more immersive.