C. S. Lewis Web Resources
C. S. Lewis Foundation
Timeline of Lewis' life and a thorough list of books by and about Lewis.
The C. S. Lewis Reviews
By a respected Lewis scholar at Bowling Green State University. Good, reliable information not only on Lewis, but also on the other Inklings, especially J.R.R. Tolkien and Charles Williams.
Into the Wardrobe
Great features including audio clips of Lewis reading from The Four Loves and The Photograph Album. There are links to reviews of Shadowlands and other scholarly articles about Lewis.
Devoted exclusively to Lewis' great fantasy work, The Chronicles of Narnia. It includes detailed maps of Narnia as well as illustrations and descriptions of all the characters (humans, talking beasts, and mythological).