Post tactics from the Najdorf opening here. The most instructive tactics will probably be those that come from the early moves as opposed to those 40-60+ moves into the game (unless there is special feature from those endgames that is common to the Najdorf). Also, remember that explanations and/or lines will be useful, especially in an opening as complicated as this one.
Winning with the Najdorf Sicilian, Zaven Andriasyan, New in Chess, 2013. The Sharpest Sicilian 2012, Kiril Georgiev, Atanas Kolev, Chess Stars, 2012. Play the Najdorf Sicilian, James Rizzitano, Everyman Gambit, 2010. Mastering the Najdorf, Julen Arizmendi and Javier Moreno, Gambit, 2004. Play The Najdorf: Scheveningen Style – A Complete Repertoire for Black in this Most Dynamic of Openings, John Emms, Everyman Chess, 2003. The Complete Najdorf: Modern Lines: The Definitive Guide to Fischer and Kasparov's Favorite Chess Opening, John Nunn, Batsford, 2003.