Currently (Feb 08), I work as a web designer/developer and usability specialist. I built an application several months back that uses many features of jQuery 1.1.2 and most features of interface 1.2 (now called jQuery UI). Thanks to these frameworks the majority of this application is cross-browser and standards compliant. Also, it was developed in a short 2 week time frame which would have been virtually impossible without jQuery and interface. The application shows some great uses for jQuery and interface. It is particually interesting from a UI and usability perspective. You can read more, demo it and download it at the following link…
http://www.hickendesign.com/mark/WorkExamples/StrategicRetreat07/