I put together a little example showing how to create an image Carousel based on data fetched from an RSS feed over on my blog just now. Hopefully it demonstrates how to piece components together with data in Sencha Touch 2 to achieve a pleasing whole.
There's a live demo up at http://code.edspencer.net/apod - open it up on your mobile device for the best experience (and add to your home screen for the even bester experience).
If anyone has anything they'd like me to cover in other blog posts just let me know in this thread. There's every chance I'll get bored of blogging and decide to never do it again, but if I do your topic may just be the lucky one that gets some nonsense written about it by me.