1. A good list of links to various sites on the film:
http://www.christophernolan.net/memento_un.php
2. Great discussion of the noir protagonist:
http://benefitofthedoubt.miksimum.com/2009/04/two-forms-of-film-noir-protagonist.html
3. Additional resources on noir film:
http://www.filmsite.org/filmnoir.html
http://en.wikipedia.org/wiki/Film_noir
http://www.imdb.com/chart/filmnoir
http://moderntimes.com/style/
4. Resources on non-linear narratives
http://en.wikipedia.org/wiki/Nonlinear_narrative
http://en.wikipedia.org/wiki/List_of_nonlinear_narrative_films
http://filmmakeriq.com/2009/08/non-linear-narratives-the-ultimate-in-time-travel/
http://aramique.blogspot.com/2009/05/nonlinear-narrative-jj-abrams.html
5. Resources on tragic characters
http://shakespeare.nuvvo.com/lesson/4435-elements-of-a-tragic-hero-in-literature
http://www.britannica.com/EBchecked/topic/253196/hamartia