Just wondering how the tabs work, as in theory they should be impossible. As far as I know mobile browsers tend to not support position:fixed and similar "tricks".
Does Sencha Touch implement custom scrolling? It looks fairly good, but when comparing it to a "normal" web site I had the impression that normal web site scrolls a little bit smoother (tested with Android on a Nexus One).
It might still be a compromise I am willing to live with (since there are also no real alternatives), but it would be nice to know how it works.