I have begun work on a RoR app that maps Rails RESTFul controllers to OTRS/ITSM API via the OTRS json interface.
Relies heavily on ActiveModel and I am trying to make the methods look/feel like you are using full ActiveRecord.
I have modified the supplied json.pl (I believe this is bundled as part of the iPhone package) to add in support for the ITSM modules one-by-one as I have needed.
I have posted this on GitHub.
Still a work heavy in development, however is useable for searching/creating tickets, linking objects (Tickets, CI's, etc), currently working on change management/work order system.
App is currently made to be slipped into an existing rails app or to run as a stand-alone app that communicates with your existing app via json.
I have not created any views.git://github.com/cpuguy83/rails_otrs.git