[Skunkworks] Creating Pivot Table functionality with PHP/JS

Dear listers, Has anyone out there implemented a Pivot Table feature using some PHP/JS library? Google has led me to mzPivotGrid<http://www.sencha.com/blog/mzpivotgrid-a-pivot-table-for-ext-js/>for Sencha, and the FlexMoster Pivot Table<http://www.flexmonster.com/Demo/flash-pivot-table-component-demo>component, both of them commercial. Anymore libraries I have not checked?