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jQuery Mobile is a set of jQuery plug-ins and widgets that aim to provide a cross-platform API for creating mobile web applications. In terms of code implementation, jQuery Mobile is very similar to jQuery UI, but while jQuery UI is focused on desktop applications, jQuery Mobile is built with mobile devices in mind.
As of this writing, jQuery Mobile is still in its Alpha 4 release, with beta just around the corner. There are still plenty of issues that are being fixed, but the jQuery Mobile development team has said that they consider the library to be feature-complete for their 1.0 release. Although the documentation is sparse, especially compared to the extensive documentation for the jQuery project itself, the forums are very active.