It's a jQuery plugin for building sleek animations, automatic navigation, and themes for mobile WebKit browsers like G1, iPhone and Pre.
Documentation can be found here.
Here are some key features of "jQTouch":
· Easy to install. Get up and running in a few minutes.
· Entirely customizable with selector options
· Theme support, including default Apple and jQTouch custom themes
· Callback functions throughout, including swipe and orientation change detection
· Page history management and CSS3 page transitions, including 3d flip
· Easily allow apps to run in fullscreen mode with custom icons and startup screens
· The power of jQuery to build AJAX applications