Hello guys,
My question maybe relates more to math and less to ‘pure’ OpenGL:
Given an input of N vertices of a polygon to the GLU tesselation algorithm, what is the maximum number of vertices / triangles expected? 
There’s a partial answer for you here:
http://www.opengl.org/discussion_boards/ubb/ultimatebb.php?ubb=get_topic;f=6;t=000659;p=1#000001