I'm missing something here -- the Tufte notion of sparklines refers to "data-intense, design-simple, word-sized graphics". To me these are much larger and are much more like traditional graphs.
Actually, it does work on IE, because it uses the excanvas library from Google. Most canvas operations can be emulated this way, only failing when a high level of performance is necessary (i.e. I made a tower defense game in the canvas and it played very poorly in IE, although it did play).
http://www.willarson.com/code/sparklines/sparklines.html