I just gave a quick demo of this powerful and amazing feature that is often overlooked in the SharePoint Business Intelligence visualizations – the presentation deck is on SlideShare.  Note that Visio Services in SharePoint 2010 does not require the viewers to have Visio – the diagrams are rendered as images or Silverlight. These images can be connected to external data sources to provide live, rich visual context. You can also add interactivity into diagrams to enable drill-through and also pass parameters to other web parts. Here are a few samples of a simple heatmap, retail floor plan connected to POS data, hotel room availability, a strategy map, a business process diagram and a map.  There are many other examples that overlay images and objects to get even more creative!

To learn more about Visio Services Data Driven Diagram features  check out: