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3D Web (o3d)
o3d is a library from Google to create 3d graphics in your browser. All major browsers are supported. Real-time editing of code is supported. Seems like shaders are supported too.
o3d homepage + video of how it works
download o3d plugin
There are some glitches in demo, but seeing how it's an early release (April 2009), I think they'll work it out.
This is the future of 3D web.