Are you fed up with figuring out all the bazillion commands in Sencha CMD? Do you just want to concat and minify your app without figuring out what the heck Sencha Cmd is asking you to do?
Imagine if you could just use a tool like grunt, have it figure out the app dependencies correctly and allow you to use any other grunt plugin.
I introduce my very basic grunt plugin: https://npmjs.org/package/grunt-sencha-dependencies
It just does one thing, given a js file with an Ext.application in it, what are all the other is files it needs in order to run.
It likely has bugs, and will probably need more features, but for now it does the job. So please give it a go and give me some feedback on what else you think it needs.
Update 10/02/2013 – See the follow up post Using grunt with Ext.js 4.x projects for a detailed example of this in use.