Shapely 1.0a2

Shapely is a Python package for programming with geospatial geometries, 
and provides integration with Numpy (and thereby matplotlib and a number 
of other packages). It depends upon libgeos_c from GEOS (2.2.3 is best, 
not well tested with the 3.0alpha).

http://pypi.python.org/pypi/Shapely/

If you have setuptools, installation is as simple as:

$ sudo easy_install Shapely

Cheers,
Sean