jQTouch b4 will ship with both Zepto.js and jQuery as framework options. For those who don’t know, Zepto.js is a project by Thomas Fuchs that essentially recreates the jQuery API (dollar sign selector engine, $.ajax, etc.), but optimized for WebKit, our target mobile platform in iOS, Android, BlackBerry, and WebOS. The primary win here is filesize/loading speed — Zepto.js comes in, minified and gzipped, at ~8kb, while jQuery, under the same settings, comes in at about 34.7kb. I’ll post more detailed information on this improvement later, as I go more in depth about loading times. As it provides a similar API to jQuery at a fraction of the weight, Zepto.js will be the default library moving forward.