Cool project. Like others have said, not particularly convinced that it's cheaper than Google's enterprise geocoding, but I'm more than glad to see the competition.
I wrote you guys a Ruby client: https://github.com/davidcelis/geocodio
The code's maybe a bit rough, but it's worked in my limited usage. Maybe you can take it for a test run before I push version 1.0.0 to RubyGems?