Quote:
...And here´s a really stupid follow up question: is the same type of effects possible with vertex shaders as with pixel shaders?
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Not a stupid question at all, I only wish I had an easy answer for it. 
I don't know how much you know about the D3D graphic pipeline but, assuming you have a basic understanding, Vertex Shaders replace the Transformation & Lighting stage allowing you to move and light verticies in your own way. The Pixel Shader replaces the Multitexturing stage, allowing you to mess with the individual pixels that are displayed. So I guess the short answer would be no.
Vertex Shading can be done in software or hardware. Pixel Shaders are hardware only (which is why some cards support Vertex and not Pixel Shading).
That is the "high level" answer. If anybody has a better one I'd love to hear it (I'm still very new to this  ).
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