Creating accessible charts using canvas and jQuery | Filament Group, Inc., Boston, MA
http://www.filamentgroup.com/lab/creating_accessible_charts_using_canvas_and_jquery
"Data visualization in HTML has long been tricky to achieve. Past solutions have involved non-standard plugins, proprietary behavior, and static images. But this has changed with the recent growth in support for the new HTML Canvas element, which provides a native drawing API that can be addressed with simple Javascript. This article is a proof of concept for visualizing HTML table data with the canvas element."