This site says of itself "Graphs and charts are great because they communicate information visually. For this reason, graphs are often used in newspapers, magazines and businesses around the world.NCES constantly uses graphs and charts in our publications and on the web. Sometimes, complicated information is difficult to understand and needs an illustration. Graphs or charts can help impress people by getting your point across quickly and visually.Here you will find five different graphs and charts for you to consider. "
It's obviously a site designed for children, but that's no reason not to use it if you need to bash out a quick graph and you're not sure where to start.