This question was already asked some time ago but with no answers from anybody:

Are there any plans either by the Ext team or the community to build an Ext wrapper for the Appcelerator Titanium API as it has been done for Adobe AIR?

Since this project (Appcelerator Titanium) continously grows and is heading towards a stable version I think about using it as an alternative for my Adobe AIR projects. When having a similar API to Ext.air I only need slight changes in my source to get the application run on air and titanium.

More information about titanium: