The WebChurch is exceedingly fond of CS Lewis. One of the most stimulating usenet groups around can be found at: alt.books.cs-lewis. Some of the best Lewis sites are:
The CS Lewis Page
Considered by some to be *the* CS Lewis site on the web. Biography material. photographs, links to other Lewis sites, Lewis events - and a chat room.
Super stuff - maps of Narnia, your CS Lewis questions answered, information about Lewis' books and details of all the CS Lewis societies and events.
CS Lewis FAQ
The most frequently asked questions about CS Lewis are answered by his stepson, Douglas Gresham.