Added Polysphere object thanks to metalliandy.

Updated version & bl_info,
Added Authors to the base of gpl block as the list was too long.

add_mesh_extra_objects/__init__.py

@@ -15,11 +15,12 @@
 #  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 # ##### END GPL LICENSE BLOCK #####
+# Contributed to by Pontiac, Fourmadmen, varkenvarken, tuga3d, meta-androcto, metalliandy #
 
 bl_info = {
     "name": "Extra Objects",
-    "author": "Pontiac, Fourmadmen, varkenvarken, tuga3d, meta-androcto",
-    "version": (0, 1),
+    "author": "Multiple Authors",
+    "version": (0, 2),
     "blender": (2, 5, 9),
     "api": 39933,
     "location": "View3D > Add > Mesh > Extra Objects",
@@ -39,12 +40,14 @@ if "bpy" in locals():
     imp.reload(add_mesh_gemstones)
     imp.reload(add_mesh_gears)
     imp.reload(add_mesh_3d_function_surface)
+    imp.reload(add_mesh_polysphere)
 else:
     from . import add_mesh_extra_objects
     from . import add_mesh_twisted_torus
     from . import add_mesh_gemstones
     from . import add_mesh_gears
     from . import add_mesh_3d_function_surface
+    from . import add_mesh_polysphere
 
 import bpy
 
@@ -63,6 +66,8 @@ class INFO_MT_mesh_extras_add(bpy.types.Menu):
         layout.menu("INFO_MT_mesh_basic_add", text="Basic Objects")
         layout.operator("mesh.primitive_twisted_torus_add",
             text="Twisted Torus")
+        layout.operator("mesh.primitive_polysphere_add",
+            text="Polysphere")
 
 
 class INFO_MT_mesh_gemstones_add(bpy.types.Menu):

add_mesh_extra_objects/add_mesh_polysphere.py

+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+'''
+bl_info = {
+    "name": "Add PolySphere",
+    "author": "Andy Davies (metalliandy)",
+    "version": (0,1,5),
+    "blender": (2, 5, 8),
+    "api": 37702,
+    "location": "View3D > Add > Mesh > PolySphere",
+    "description": "Adds a PolySphere (all quads) for sculpting",
+    "warning": "",
+    "wiki_url": "http://wiki.blender.org/index.php/Extensions:2.5/Py/"\
+        "Scripts/Add_Mesh/Add_PolySphere",
+    "tracker_url": "",
+    "category": "Add Mesh"}
+'''    
+"""
+About this script:-
+This script enables the creation of a "PolySphere": an all quad sphere for use in sculpting and is intended to be used in place of a standard UVSphere, where the poles on would cause pinching and other unwanted artefacts.
+Apart from being all quads, the advantages are that the topology is distributed evenly across the surface and that they also use only around 80% of the geometry of a comparable resolution UV sphere.
+
+Usage:-
+Activate the script via the "Add-Ons" tab under the user preferences.
+The PolySphere can then be accessed via Add Mesh> PolySphere.
+
+
+Related Links:-
+http://blenderartists.org/forum/showthread.php?t=205444
+http://www.metalliandy.com
+
+Thanks to:-
+Dealga McArdle (zeffii) - http://www.digitalaphasia.com
+
+Version history:-
+v0.1.5 - Ammended script for compatibility with recent API changes.
+v0.1.4 - Ammended script and changed bl_info for compatibility with recent API changes.
+v0.1.3 - Ammended script for compatibility with recent API changes.
+v0.1.2 - Ammended script meta information for compatibility with recent API changes.
+v0.1.1 - Cleaned code up a little and incresed the scale of the final PolySphere to 2 units.
+v0.1 - Initial revision.
+
+"""
+
+import bpy
+
+def Add_PolySphere():
+    #Add Cube to scene
+    bpy.ops.mesh.primitive_cube_add()
+
+    #Changes name of Cube to PolySphere adds the variable cube
+    cube = bpy.context.object
+    cube.name = "PolySphere"
+
+    #Positions Cube primitive to scene centre
+    bpy.context.active_object.location = [0, 0, 0]
+
+    #Adds Subsurf Modifier
+    bpy.ops.object.modifier_add(type='SUBSURF')
+
+    #Selects Subsurf Modifier for editing
+    subsurf = cube.modifiers['Subsurf']
+
+    #Changes Subsurf levels
+    subsurf.levels = 3  
+
+    #Applys Subsurf Modifier
+    bpy.ops.object.modifier_apply(apply_as='DATA', modifier="Subsurf")
+
+    #Adds smooth shading
+    bpy.ops.object.shade_smooth()
+
+    #Change to Editmode
+    bpy.ops.object.editmode_toggle()
+
+    #Selects cube in Editmode
+    bpy.ops.mesh.select_all(action='TOGGLE')
+
+    #Adds transform "To Sphere"
+    bpy.ops.transform.tosphere(value=1)
+
+    #Change to Objectmode
+    bpy.ops.object.editmode_toggle()
+    
+    #Scales Object to 2.0 Units
+    bpy.ops.transform.resize(value=(1.15525, 1.15525, 1.15525), constraint_axis=(False, False, False), constraint_orientation='GLOBAL', mirror=False, proportional='DISABLED', proportional_edit_falloff='SMOOTH', proportional_size=1, snap=False, snap_target='CLOSEST', snap_point=(0, 0, 0), snap_align=False, snap_normal=(0, 0, 0), release_confirm=False)
+    
+    #Applys location, rotation and scale data
+    bpy.ops.object.transform_apply(location=True, rotation=True, scale=True)
+
+#makes PolySphere an operator
+class AddPolySphere(bpy.types.Operator):
+    
+    bl_idname = "mesh.primitive_polysphere_add"
+    bl_label = "Add PolySphere"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    def execute(self, context):
+        Add_PolySphere()
+        return {'FINISHED'}
+'''
+# Register the operator
+def menu_func(self, context):
+    self.layout.operator(AddPolySphere.bl_idname, text="PolySphere", icon='PLUGIN')
+
+
+def register():
+    bpy.utils.register_module(__name__)
+    bpy.types.INFO_MT_mesh_add.append(menu_func)
+
+
+def unregister():
+    bpy.utils.unregister_module(__name__)
+    bpy.types.INFO_MT_mesh_add.remove(menu_func)
+
+if __name__ == "__main__":
+    register()
+'''
\ No newline at end of file