Sparklines is a component for GWT and Vaadin that implements sparklines as described by Edward Tufte.

A sparkline is essentially a small linegraph and some numbers, but it's best described by Tufte himself: see Tufte's book "Beautiful Evidence" or view the chapter about sparklines online at his site http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0001OR

Also see the Vaadin Directory page at http://vaadin.com/addon/sparklines