Nobody at Infochimps uses 1.8 internally, and we lack a full test framework to ameliorate that. Therefore, we don't officially support Ruby 1.8, although we will happily accept pull requests aimed at keeping Ironfan working there as well.
Not 100% sure where this should end up; probably in the README. @mrflip, please chime in if you have other suggestions.
Updated the READMEs; closing.
To anyone who wants to port: