Available iPhone Web Application JavaScript UI Library/Frameworks

Old question, but still relevant. Sencha (the new name of the company behind ExtJs) just released the mobile app platform Sencha Tounch for iPhone, iPod, iPad and Android:
http://www.sencha.com/products/touch/

Blog post that explains the difference between jQTouch and Sencha Touch:
http://9-bits.com/post/723711597/jqtouch-and-sencha-touch

Update: John Resig recently announced that the jQuery team is working on a mobile UI library. Looks promising: http://jquerymobile.com/2010/08/announcing-the-jquery-mobile-project/

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