This is more a note for me to remember the link than anything, but if you’re interested in learning more about HTML-based (or just regular) Data Visualization, there’s an excellent collection of products condensed into one place:
My two personal favorites on that list: D3 and Raphael.
D3 is as robust as a cake-loving kid with a slow metabolism (shout out to my brother John!), and there’s a great tutorial for D3 from Scott Murray that will get anyone started. (skip/glean through the first couple of tuts if you’re already a JS/CSS junky)