Flot is a jQuery extension which uses the canvas drawing method of javascript. I've added their example test to the PBooks code base to try it out:
http://www.pbooks.org/demo/index.php?nid=flot-test
Cool, huh? I can't wait to start feeding some financial data into those charts! :-)
UPDATE February 20, 2008: I've removed the flot test from the code base for now to focus on other priorities.