Some grad students at the University of North Carolina have put together an interesting website dedicated to the legend of John Henry. The site provides information, lyrics, and helpful links.
This page from the New York Times Sunday Book Review offers more than a review of Scott Nelson’s book on John Henry. It provides a terrific photo gallery as well.
National Public Radio’s Present at the Creation project includes a page dedicated to the ballad of John Henry. Audio files and images support a brief overview of the ballad and the legend behind it.