I am developing an app that will calculate 2-D arrays of numbers. Of course, the real question is how to format the data in a way that makes sense. I saw the article on the 2D Data Visualization Class. This is the sort of what I'm looking for. Although, I may want to view the raw data and the graphed data in seperate views. I also have seen the Excel automation example on MSDN. I want to avoid being dependent on another app being present. What are the favorite tools out there? My needs are simple so I don't need a tool that costs thousands. I would be perfectly happy with a freebie as long as it was documented well with good examples. Thanks! Keith Ramey