A new live demo of SeaChart is available at seachart.seasidehosting.st.
SeaChart components are standard Seaside web components that you can easily embed into your Smalltalk web application. Demos include PlotKit
CSS Bar Graph, Numberd List, Star Rater, Fade In and Cross Fade.
You can also download the code from SqueakSource.
Also have a look at scriptaculous.seasidehosting.st for more free Seaside components.