There are many different types of materials on the site (biographical timeline; small collection of paintings with titles and dates; photographs and descriptions of some murals) and it is very easy to navigate. There are some VERY interesting original materials on the site, for instance clippings of a magazine to which Rivera contributed in 1928-1930 as well as film clips (in English) discussing Rivera's paintings.
Unfortunately, the majority of the material is exclusively in English with about a quarter in both languages.
The majority of the media was easily accessible, however when I clicked on the photos on the "Biography: Chronology" page, I was taken to a page that said "NOT FOUND"
The "Virtual" Panorama views of the Anahuacalli Museum were almost too small to make-out and I was not able to zoom in at all. The Film clips were also very small and the one titled "Man in crossroads" did not open at all.