We just made an awsome commit to our REST api on github. This has introduced support for Joomla 1.6! Yes you can now use the super simple REST api on Joomla 1.6 as well!
Get hold of the REST api on github - https://github.com/techjoomla/Joomla-REST-API
I hope all of you find this release useful. I can already imagine so many mobile app developers thinking of porting their applications to Joomla 1.6! Thanks for your support guys!