I wanted to show off a new (and quite large) Ext JS application that we worked on for over a year. It's built with Ext JS 3.0 and uses Ext.Direct via symfony and the dsExtDirectPlugin. From a browser standpoint it's all a single-page application so you can traverse from 'module' to 'module' without the browser loading a new page. Check it out the video and let me know what you guys think!
Thanks tobiu. We used FusionCharts (http://www.fusioncharts.com/). Our charting requirements were somewhat complex so implementation was a little tricky but working with FusionCharts itself was pretty straightforward.