OGR summary
Summary of the ogr module used for vector data access
OSR summary
Summary of the osr module used for projections
GDAL constants summary
Summary of the gdalconst module used with the gdal module for raster data access
GDAL summary
Summary of the gdal module used for raster data access
GDAL Numeric summary
Summary of the gdalnumeric module used with the gdal module for dealing with large arrays
Python Programming Language
Official website
Python Standard Library
This is my favorite source for Python documentation
Numerical Python (HTML)
Documentation for the Numeric module (which is what FWTools uses)
Numerical Python (PDF)
Documentation for the Numeric module (which is what FWTools uses)
NumPy
Documentation for the numpy module (which is what most newer versions of GDAL use)