Nice tool! This will be helpful in the Sencha forums when a dev asks you for code related to bug reports. Although, I wish it was using ST2, and not ST1.

Here's one I did in a couple of minutes that displays HN items: http://senchafiddle.com/#Ba4nZ -- Fiddle Mode http://senchafiddle.com/server/full.php?token=Ba4nZ -- Full Screen