I have created a useful controller for generating on-the-fly bar graphs. This can be custom tailored by adding to the url. This controller was designed for the Zend Framework but can be modified to be used anywhere. If you would like a copy, just contact me via the contact us page.

Basic Bar Graph
URL:http://www.ddddesigns.com/dynamicimaging/bar/values/1|2|3|4|5/labels/England|Japan|Ireland|Australia|United%20States

Bar Graph with transparency, resized, recolored, and reduced font size.
URL:http://www.ddddesigns.com/dynamicimaging/bar/values/5|2|1|4|7/labels/England|Japan|Ireland|Australia|United%20States/transparency/1/height/100/width/350/barColor/3B787B/depthColor/000000/guideColor/333333/fontSize/1/