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What is it, exactly, that Vista supplies that XGL and Linux doesn't? Details, please...
Vista supplies the entire WPF programming model. XGL is just an Xserver that uses opengl.
I know the difference between WPF and XGL. I agree that Windows is currently ahead, but I see strong evidence that Linux is catching up quickly. Basically, someone just needs to create a good library and the WPF advantage would be gone.