One of the first things that occurred to me was how this could be used to solve the problem of dynamically adding the file size to links. The resulting script I wrote is being used on this site, so before I explain how it works here's a quick demo of a pdf document (pdf 2.8 MB) and an mp3 file (mp3 4.9 MB). For a further demo take a look at this basic file.
Lightweight but rich data grid with resizable columns and a scrolling data to match the headers, plus an ability to connect to an xml based data source using Ajax to load the content. Similar in concept with the Ext Grid only its pure jQuery love.