Nick Zuccarello shows how to set up Maya for re-topologizing workflow and shows how to create a Resurfacing Script to Setup Maya for Re-topologizing sculpted models using Maya commands. Check out the tutorial for Creating a Resurfacing Script in Maya for Re-topologizing Models here.
Also dealing with Retopoloy in Maya, Leonardo Covarrubias has created a tool for such a task; Inspired from seeing the RetopoG set out to create his own Basic Retopology Tool for Maya, and this was the birth of lcRetopoBasic for Maya. lcRetopoBasic for Maya makes use of Maya Live Surface features to draw new topology on a model and is written in PyMel. Check out the lcRetopoBasic for Maya post and lcRetopoBasic for Maya download here.
