Web Sources
PAL: Perspectives in American Literature - A Research and Reference Guide http://www.csustan.edu/english/reuben/pal/TABLE.HTML
PAL: Perspectives in American Literature. Created by Paul P. Reuben of California State University, Stanislaus, PAL is arranged like a textbook and contains chapters on "Early Twentieth Century to 1945," "Late Twentieth Century: 1945 to Present," "American Drama," and "Harlem Renaissance." Each chapter contains an introductory essay, selected bibliographies, and information on authors.
Internet Public Library: Literary Criticism http://www.ipl.org/div/litcrit/
The beginner's guide…
Literary Resources on the Net http://andromeda.rutgers.edu/%7Ejlynch/Lit/
Compiled by an English professor at Rutgers. Emphasis on American and English literature and literary criticism
Voice of the Shuttle http://vos.ucsb.edu/
The best humanities resource on the Web, maintained by Alan Liu at UCSB and including countless links to literary and general humanities websites. Relevant topics for literary criticism include Literature (in English) and Literary Theory
The Boston Book Review http://www.bookwire.com/bookwire/bbr/bbr-home.html
"Seeks out and promotes the highest achievements in contemporary writing. Bringing readers into the ongoing project of literary life, the BBR features incisive, independent comment from preeminent writers, scholars and intellectuals on today's most important books." I love this site.