http://www.officaltomwaits.com is Seth Nielsen's excellent, comprehensive site on Tom Waits, set up in cooperation with Epitaph Records. Especially informative is the "Tom Waits dictionary", a work in progress trying to illuminate some of Waits' more enigmatic lyrical references. If there's anything missing on this site, you'll definitely find it on http://www.front.net/gtausch/waits.html,
another great fan site.