Xanthians Online - Xanth-related information, activities, and downloads, with links, madlibs, and information on Piers Anthony. - http://www.xanthians.com/
Jaxanth Above the Gap Chasm - An overview of Xanth with bibliography and links. - http://www.webbyx.com/xanth/about.htm
Xanth World - Site includes a complete list of Xanth novels, descriptions of the various character types found in Xanth, and the site author's story of how she got hooked. - http://www.msu.edu/~yeagerk1/xan.html