We did this over the weekend for a project we are working on , i thought you might want to see it and give me your comments on it , should i continue with the idea or not , its not our core business rather than tinkering with Code 
I would love your feedback , it runs in the browser and it supports different materials , its free for all
The MXD3D Viewer :
http://models.mxd3d.com/ui/default/index
Cheers
Mo