RoboFab Step by step.
Almost completely updated for UFO2.
These are chapters about scripting in Python, where and how to make your code and how to use RoboFab objects. Illustrated with many examples. These documents started out as conference notes for the Robothon09 Conference. It has been updated for UFO2.
More step by step sections:
The Unified Font Object Specification site featuring the UFO 2 extension.
Find dozens of useful packages at the TypeSupply.com public code repository, for instance Dialog Kit, Defcon, UFO2DK and many more.