There's an interesing string of posts on the MakeHuman forum
discussing how the GPL extends not only to the code written to manage MakeHuman, but the base mesh and targets that are manipluated by Blender. Basically since the bash mesh and targets are GPL any resulting meshes or images generated by MakeHuman must in turn be GPL.
This is an especially interesting discussion from the perspective of CrystalSpace (or other engine) developers since it brings to light the differences (and similarities) of GPL'ing code and content
. It appears that the MakeHuman devs are going to need to switch licenses for the base mesh and targets. This could be of particular interest to people wanting to create commercial games from open-source projects.