I have been experimenting with Ant integration in the Sencha Touch build process lately. I'm totally new to Ant but quickly became excited by its capability.
As a way to dig in, I created a project that automates the creation, building, and running of Android and iOS enabled PhoneGap projects with Sencha Touch. My goal was to make something that worked with the framework and was as easy to use as possible without requiring any extra installs. I'd be glad to get some feedback on it. I have been using it for quick mockups and light development tasks.
You can check it out on github: https://github.com/bricemason/sencha-cordova-builder
I'll also do a screencast early next week to go over how to use it.