CMSX-Ti-Demo is a project mainly written in ..., it's free.
This is a demo Titanium Mobile app for the CMS Expo 2011 - http://www.cmsexpo.net/
It uses com_api for Joomla! built by Brian Edgerton: https://github.com/brianedgerton/com_api
Quick video of first run at it: http://www.screencast.com/users/XiDScreencasts/folders/Jing/media/841dd58b-2095-4e21-ae94-a267b2bce02a