It would be good to add a 2 similar overview pages for the Spark and h2o Bindings and engines. These would go under an "Engines" section in the "Mahout Environment" menu on the site. Topics would include: a brief overview of each engine, how the Drm API is backed in each enigne, ie. Spark RDDs and h2o Dataframes, Interoperability with each engine-native datastructure within an application e.g. Drm.rdd. Any other pertinent information.