Drawing 3D sprites in screencoords?

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How do I draw "2D" in screen coordinates using 3D objects.
The reason I want to do this is that I want real alpha blending in my GUI. (So just quads with texture+alpha blending really)

I can see that I can project a 3D object onto the 2D screen but that's not exactly what I'm after :)

Thanks in advance

Ozak