And Spine Mobile: http://spinejs.com/mobile

(disclaimer - I'm the author)

Can you clarify if Spine is actually cross platform (at least to Android if not elsewhere)? A statement of such is conspicuously lacking from the web site, leading me in combination with the giant oversized iPhone pic to believe it is probably not. If it is, you could do yourself a favor and make it more clear.

Feels snappy but the demos feel a bit incomplete.. On my phone (iOS5) the address bar not receeding in particular spoils the top two examples.

Is it any good?

dojoMobile: http://dojotoolkit.org/features/mobile.php xUI: http://xuijs.com/ Zepto (i think it's done by scriptaculous creator): http://zeptojs.com/

PhoneGap tools site has others too: http://phonegap.com/tools/