Project: Blender Extensions
Tracker: Py Scripts Upload
Blender: 2.62
Category: 3D View
Python: 3.2
Script name: Centroid (Geometric Center)
Wiki page: http://wiki.blender.org/index.php/Extensions:2.5/Py/Scripts/3D_interaction/Centroid
Dependencies: bpy_extras.mesh_utils
Author(s): Martin Bürbaum
Status: Open

Calculate the centroid (geometric center) of a mesh object.

The original script (1.0.1) has only one new operator:
"Snap Cursor to Centroid"
... which does exactly what the name says.