A site maintained by Lenny de Rooy
http://www.alice-in-wonderland.net
A site maintained by Lenny de Rooy, with everything you want to know about Alice. Info on the books and the Disney adaptation. De Rooy has some strong opinions, but her site is charming and informative.
An interesting personal essay
http://www.salon.com/weekly/carroll960930.html
An interesting personal essay written by novelist Joyce Carol Oates. Oates talks about her childhood love for the Alice books, and the essay is a charming and insightful read.
The whole book
http://www.hoboes.com/html/FireBlade/Carroll/Alice/Wonder/
The whole book; on line.
A good collection of John Tenniel's eerie illustrations
http://www.math.umn.edu/~rudnaya/books/Alice1.html
A good collection of John Tenniel's eerie illustrations, from the original publication of the book. Worth a look; Tenniel's drawings capture the guts of the book's important moments.
An excellent resource on Lewis Carroll
http://landow.stg.brown.edu/victorian/carroll/carrollov.html
An excellent resource on Lewis Carroll. Includes biographical information, social context, and interpretations of his work.