Although I tend to focus and all forms of literacy I do believe, as a librarian, that if one were to rely upon one basic form of literacy it should be reading a language. Here is an interesting documentary that I have not watched, but looks to have much promise for those of us in the literacy business, especially libraries and schools. It is hosted/narrated by Henry Winkler (the Fonz).

Check it and more info about it at: http://www.readingrockets.org/shows/watch#brain.