The Simile project at MIT is offering free, open-source widgets that let you create data visualizations on web pages. The four options are “Timeline,” “Timeplot,” “Runway” (creates a cover flow), and “Exhibit” (supports sorting and filtering). Below is an sample of a “Runway” visualization. Learn more at http://www.simile-widgets.org/
I tried the widget myself (http://learning.nd.edu/runway/). The documentation was skimpy, but it was pretty easy in the end. I hate to complain, but it would be nice if the widget allowed you to link to a web page.