Create a Graph is an older website with new capabilities. We used it today to graph the occupations of the crew on the Titanic (part of a huge project). It's not rocket science but made nice looking graphs more quickly than excel.
I played with this a bit, and it has some nice results. Your chart can be exported as a graphic, meaning you can build it into a webpage, which is really nice. Does anyone happen to know if Excel can do something with charts?
You can make charts and graphs with Excel but applying "design" features is less intuitive for kids. One drawback with "Create a Graph" is there is a limited # of cells for data (50) and if you insert that many items you can't read them on the graph saved as a jpeg (font too small).