In my test the way shrink wrap work is slightly better than the project all method found in zbrush.
After you do the retopo,you have to project surface on surface,this give problem in some region(where the surface is concave)but the shrink wrap doesn’t go crazy trying to project things in different part of the mesh.
It’s clear that you have first to create a mesh,but after you have good possibility to recreate the details.
cekuhnen: his e-mail address is here, at the top (I don’t post it so the spambots don’t get to it :P).