Human retopology (advice welcome) - Works in Progress - Blender Artists Community
Retopology in Blender (Beginner Tutorial) - YouTube
RetopoFlow 2.0: Rebuilding a Blender Add-On From Scratch - CG Cookie
FlippedNormals - Retopology in Blender is now done! It will be released on Saturday - 4 Hours Long - Really getting into the 'Why' - Full head Retopo in real-time - Fundamental