Pysolar is a collection of Python libraries for simulating the irradiation of any point on earth by the sun. It includes code for extremely precise ephemeris calculations.
The scikits.hydroclimpy module is a loose collection of utilities to manipulate hydro-climatologic data.
A library to handle time series in NumPy/SciPy
SunPy - Python for solar physics
web2py controller decorator that returns Jinja2 compiled template string.
Statistical plots for Python
Cartopy - a cartographic python library with matplotlib support
My own notes for contributions
Examples for Code Snipets & Data
Data Project Management for iPython