I have recently published a couple of articles on DevX.com that illustrate both the backend code that powers Rhizosphere and some upcoming features:

• Javascript as a foundation language
  
• JavaScript and jQuery: Web Apps as Highly Interactive as Desktop Apps

The former is an introduction to the Javascript language and some of the powerful paradigms that are used in Rhizosphere code, such as functional programming and closures.

The latter describes the very algorithms that power Rhizosphere dynamic features, such as selection management, elements movement, endless desktop panning and more.

If you are looking for some introductory material to get started with the Rhizosphere codebase, this is probably a good place to start from.

Additionally, it also introduces an upcoming Rhizosphere feature : Zooming !

You will soon be able to zoom in and out of your visualizations. Watch the video on the right for a preview. You can also download the source code attached to the article and start playing with it while you wait its integration into the main codebase.