Everything about Roal Dahl, and many activities here:
http://www.puffin.co.uk/static/cs/uk/15/minisites/dahlday/index.php

and you'll find lots of addresses on our colleagues Michèle Henry and Catherine Serreau's pages:
http://www.ac-nancy-metz.fr/enseign/anglais/Henry/dahl.htm
http://englishacademy.site.voila.fr/roalddahl.htm

and here is the update of a page in le Café Pédagogique with some addresses about "Lamb to the slaughter", a short story by Roal Dahl turned into a film by Hitchcock in his TV series : "Alfred Hitchcock presents":
the text of the short story
http://www.classicshorts.com/stories/lamb.html

Classroom activities
http://www.roalddahlfans.com/teachers/lamb.php

Four extracts and a lesson plan
http://perso.wanadoo.fr/frat.st.paul/LambtoSlaughter%20.pdf

Transcripts of the presentations by Alfred Hitchcock
http://www.geocities.com/SunsetStrip/Towers/7260/hitch_pr.html

Interactive activities presented by our colleague
http://perso.wanadoo.fr/absolutenglish-972/notes/mysteries/page1.htm