Curious about RetopoFlow? I think it's one of the most impressive Blender add-ons available at the moment, and I just love watching people use it to retopologize a model. CG Cookie has now released an in-depth training for it - available for free!
Jonathan Williamson writes:
If you have a high-resolution sculpted model that you wish to animate, texture, or otherwise manipulate, then you'll need to retopologize it. Unfortunately, retopology in Blender can be a terribly tedious and difficult process. The tools simply aren't optimized for a retopology workflow. This is why I designed RetopoFlow, an add-on built for artists that completely changes the way we approach retopology in Blender.
Since RetopoFlow offers a very different workflow than we're accustomed to in Blender I've just released a complete, free, Introduction to RetopoFlow course on CG Cookie.