For those of you with no jQuery background what-so-ever, jQuery UI is a series of user interface (UI) enhancements made in Javascript. These range from tabs (which also support ajax loading), to dialog boxes which you can drag, drop and resize. All cross browser! Although its currently still under development the finish line is in sight for the 1.5 release. I encourage everyone to check it out, it can add some really professional effects to your website for minimal lines of code.