Into the Wardrobe – a C. S. Lewis website
One C. S. Lewis fan, who is also a web-developer, started this page. The page has various essays and other reflections on Lewis' work.
C. S. Lewis Foundation
The official C. S. Lewis Foundation website, where aspects of his life and works are presented, and much more. The Foundation is a non-profit organization that aims to "live the legacy of C. S. Lewis."
The Chronicles of Narnia Wiki
http://narnia.wikia.com/wiki/The_Chronicles_of_Narnia_Wiki
"An encyclopedia for all things Narnia" in which anyone can create or edit an article.
The Chronicles of Narnia
The official Harper Collins (publisher) website on all things Narnia.