Note: Most of the bonus features are on DVDs, not Blu-ray Discs. The feature films are on Blu-ray.

Lord of the Rings: The Fellowship of the Ring
Over 30 minutes of footage incorporated into the theatrical release of the film
Commentary by Peter Jackson, Fran Walsh, and Philippa Boyens
Commentary by the design team
Commentary by the production/post-production team
Commentary by 10 actors, including Elijah Wood and Ian McKellen
Easter egg: MTV Movie Award Spoof (The Council of Elrod)
Costa Botes Documentary: The Fellowship of the Ring: Behind the Scenes (DVD)
The Appendices, Part 1: From Book to Vision (DVD)
 
Peter Jackson introduction
J.R.R. Tolkein: Creator of Middle Earth
From Book to Script
Visualizing the Story
Designing and Building Middle Earth
Middle Earth atlas interactive
The Appendices, Part 2: From Vision to Reality (DVD)
 
Elijah Wood introduction
Filming The Fellowship of the Ring
Visual effects
Post-production: Putting it all together
Digital Grading
Sound and music
The Road Goes Ever On...
Lord of the Rings: The Two Towers

Extended edition of the film, incorporating 43 minutes of footage incorporated into the film
Commentary track by writer-director Peter Jackson and writers Fran Walsh and Philippa Boyens
Commentary track by the design team
Commentary track by the production/post-production team
Commentary track by 16 cast members, including Elijah Wood, Sean Astin, Andy Serkis, John Rhys-Davies, Orlando Bloom, Christopher Lee, Bernard Hill, and Miranda Otto
Easter Egg: MTV Movie Awards clip (Gollum accepting award)
Costas Botes documentary: The Two Towers--Behind the Scenes (DVD)
The Appendices, Part 3: The Journey Continues (DVD)
 
Peter Jackson introduction
J.R.R. Tolkein: Origin of Middle Earth
From Book to Script: Finding a Story
Designing and Building Middle-Earth
Gollum
Middle-Earth Atlas interactive
New Zealand as Middle Earth (map with video location)
The Appendices, Part 4: The Battle for Middle Earth (DVD)
 
Elijah Wood introduction
Filming The Two Towers
Visual effects
Editorial: Refining the Story
Music and Sound
The Battle for Helm's Deep is Over
Lord of the Rings: The Return of the King

Extended edition of the film, with 50 extra minutes incorporated into the film
Commentary track by writer-director Peter Jackson and writers Fran Walsh and Philippa Boyens
Commentary track by the design team
Commentary track by the production/post-production team
Costas Botes documentary: The Return of the King: Behind the Scenes (DVD)
The Appendices, Part 5: The War of the Ring (DVD)

 
Peter Jackson Intro
J.R.R. Tolkien: The Legacy of Middle-earth
From Book to Script

Designing and Building Middle-earth
Home of the Horse Lords
Middle-earth Atlas: Tracing the Journeys of the Fellowship: interactive map
New Zealand as Middle-earth: interactive map with on-location footage
The Appendices, Part 6: The Passing of an Age (DVD)

 
Elijah Wood/Sean Astin/Billy Boyd/Dominic Monaghan intro
Filming The Return of the King
Visual Effects
Post Production: Journey's End
The Passing of an Age
Cameron Duncan