I have started to rediscover SproutCore. It's been over 2 years since I last played around with it and a lot has happened since. I'm giving a talk about using SproutCore for iOS development next month and I've built a demo application for it. It's a Google Image Search client that supports touch gestures to pinch and zoom the image and autorotation: So for best results try it out on your iPad.
Some screenshots (in the spirit of this unforgettable announcement):
Oh, and the code is on github, of course!