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<p style="margin: 0px;">On a cursory glance the one thing that was just jumping at me was that you adopted calling Simple mode "Rarely useful" - Blender chief marketing officer just fell from his chair ;-) I would suggest to say that Catmull-Clark is the commonly used mode and that Simple can be used for example to increase base mesh resolution when using displacement maps or textured emitters with indirect lighting.</p>
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<p style="margin: 0px;">While the image showing Suzanne being subdivided looks good, I think that this model might not be ideally suited to show the effects of SDS. I would suggest either using a higher resolution image so the effects can be inspected more closely or using just a cube for this example. Also I'd recommend explaining that there is no visible difference between the right three renders because the Ctrl-x shortcut is only setting the viewport subdivision and the rendering subdivision is always set to 2.</p>
<p style="margin: 0px;">While you are warning not to mix up subsurf with smooth shading, you are using smooth shading and call it smoothing in the first image - that could irritate some beginners.</p>
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<p style="margin: 0px;">Instead of warning not to have the render subsurf level higher than the viewport level (I would put that in a warning box, because it surely is important), I would rather explain that the opposite can be used to keep the viewport responsive while getting a smooth rendering result.</p>
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<p style="margin: 0px;">An example for <span class="literal">Subdivide UVs would be useful.<br /></span></p>
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<p style="margin: 0px;">You wrote "clean topology is so important" but there is no information about what topology and loops are. Once it is finished and in the wiki, this section http://wiki.blender.org/index.php/User:Mindrones/Subdivision_modelling could be linked to explain that.</p>
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<p style="margin: 0px;">I think that the last image would be more clear if you would remove the wood texture.</p>
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<p style="margin: 0px;">Just my two cents.</p>
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<p style="margin: 0px;">Georg</p>
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