On a blender nation recent post that was posted today they had something about Bsurfaces. this is a re-topology add-on for blender that used to cost about $40. now it is going GPL! this just means it is open source. and free! so if you are a modeller then check it out! here is the link to the blender nation post.
http://www.blendernation.com/2012/05/01/bsurfaces-add-on-released-as-gpl/
http://www.blendernation.com/2012/05/01/bsurfaces-add-on-released-as-gpl/