That's right! I love the discovery part of these visualizations. It helped me to find proper books many times - the graph drawing library is a result of such discovery.

I wanted to learn JavaScript. So I read a book recommended by my old Silverlight-based visualization, and developed the library.

I believe recommendation was successful. The book is Crockford's "JavaScript: The good parts" - http://www.amazon.com/JavaScript-Good-Parts-Douglas-Crockfor...