I've been using Flot a while after getting the hump about JS charting SDKs last week. A clever person I work with has ported Flot to YUI (http://github.com/bluesmoon/flot/tree/master).

I have to say I particularly like it, and I think we will be offering back some improvements to the jQuery version, such as the ability to have many more graphs on the page with destroying your browser.

I do really like the idea of Tufte graphs though. As a Tufte devotee I think I'm going to look at getting that look and feel out of flot as well.