A few weeks ago we announced Simple Tiles a mapping library for the web. Today, we're releasing Ruby bindings for the library, so you can generate tiles from Ruby.
You can check out the source over on Github. The documentation is here.
Please let us know if you have issues, questions, or bug reports either on the issues page or over on Freenode in the #propublica or #newsapps chat rooms.
If Ruby is not your thing, there are two people building Python bindings, python-simple-tiles by Sasha Hart, and simpyl_tiles by Albert Sun.
If you'd like to contribute bindings for other languages please let Jeff Larson know.