I just downloaded and installed the Dundas Chart for Sharepoint which is currently in Beta. I love the look an feel of the Dundas Charts and they add a nice touch to the UI of my Sharepoint Portals (MOSS 2007). I especially liked the capability to render the charts as Flash images, integration with BDC and Excel Services. They have a range of chart types including Renko, Kagi, Point and Figure, 3 Line Break, Radar, Range Column, Spline Range, Gantt, Box, Error Bar Chart, Fast Line Charts, Polar Charts, Pyramid Charts and Funnel Charts .