The wait is over, version 4 of FlowChart.NET has been released.  It provides the following major new features:

- rotation of boxes
- spanning table cells
- expand or collapse groups of consecutive table rows
- export diagrams to SVG

Now, without any doubt, FlowChart.NET is the best diagramming control available on the market. A trial version is available for download here:

https://mindfusion.eu/FCNetDemo.zip

Enjoy!