This request can be seen in two phases:
1: Support for dual stream photo and video formats
2: Use of these formats to support various methods of 3D vision.
Given a 3d camera is as low as $61 these days, I feel we need an extension to support 3d files is needed. Nvidias user created 3D gallery can be seen as an example.
Youtube has some documentation on how it's 3d content is created. Youtube currently supports the following formats:
5 Side by side
6 HTML5 stereo view (Active shutter 3D system)
The last three requires two streams as input (one for each eye) but the first three can be generated from them as I'd imagine the first three would be the cheapest way to acquire 3D compatibility.
Nvidia also has silverlight and HTML5 plugins for the task which may be of interest.