The point: We often have to display large amounts of data on the web. Generally we show a table of values with headings and if we really wanted to get fancy we would use a picture of a graph. People like pictures. I like pictures. Why? Because it is far easier to interpret data when it is in visual form. However, creating a picture graph and updating it with new data can be a pain. In this tutorial, we?re going to use a jQuery plugin called Flot to create graphs on the fly.

http://nettuts.com/tutorials/javascript-ajax/visualizing-data-with-flot/

[2 cents] Nice walkthrough for getting good results from the jQuery Flot plugin. Amazing piece of work, that plugin (but hey, I'm not all that mathy, so easily impressed). I'd definitely return to this if I were to want to dive into Flot a bit. Plus, NETTUS tutorials pretty much rock.