The Annotated Oscar Wao
http://www.annotated-oscar-wao.com/
A crowd-sourced guide to the difficult language and references in the novel, organized by chapter.
Junot Diaz Reads From His 'Wondrous' Tale
http://www.npr.org/2008/10/21/95764750/junot-diaz-reads-from-his-wondrous-tale
An NPR feature in which Junot Diaz reads aloud from the book
Science Fiction Encyclopedia
http://www.sf-encyclopedia.com/
A good resource for deciphering some of Yunior's sci-fi references
Interview With General Rafael Trujillo
https://archive.org/details/gov.archives.arc.647563
A freely downloadable film from 1961 of an interview with Rafael Trujillo