Apple threw their lot in with Sproutcore, the other cocoa-inspired (though not Obj-C inspired) thick client framework by hiring the lead developer (who's now departed) and implementing MobileMe with it.
I am well aware of SproutCore, but Capuccino is more cleaner than Sproutcore in that you just write Obj-J, not worry about HTML, CSS. The Capuccino framework works well because it's exactly like iOS kit and the native app export option is way better than Adobe AiR - no flash, all JS!
I wish SproutCore dev could be faster - it's god awfully slow with dev server and preview. But, that's not a big problem for now.
