Digital Book Index - Provides links to more than 100,000 title records from more than 1800 commercial and non-commercial publishers, universities, and various private sites. About 61,000 of these books, texts, and documents are available free.
Dustbooks - A collection of directories of small publishers, magazine editors and publishers, plus the Small Press Review. Offers listing forms, advertising rates and order desk.
Inlibris - Large directory for literature sites and resources, including books, writers, workshops, and hypertexts, provided by literary publisher Badosa. Also in Spanish and Catalan.
Literary Resources on the Net - Extensive academic directory of Internet literary resources, maintained by Jack Lynch of Rutgers University.
Literature Classics - Literature database that includes essays and links, as well as forums, a chat, and creative writing submissions.
LitLinks - University of Alberta's guide to the best literary sites online.
SHARP - The Society for the History of Authorship, Reading, and Publishing, featuring a wide variety of resources for those interested in the history of print culture in any place or period.