Looks like there are some better recommendations for book-related charities: http://www.washingtonpost.com/news/the-intersect/wp/2014/05/...
Charities rated highly on Charity Navigator: http://www.firstbook.org/ http://www.cliontheweb.org/
Charities rated highly on Charity Navigator: http://www.firstbook.org/ http://www.cliontheweb.org/