WIDE WEB Yahoo Book Reviews has links to pages that cover all types of book reviews. New York Times Book Review is full text for all of 1997-98 and searchable for citations back to 1980.
Registration is required, but it is a free service.
One features the full text of first chapters of new fiction and non-fiction. It is part of Washington Post Bookworld , published every Sunday. New York Review of Books is a shortened weekly version of the acclaimed print edition. It includes a searchable archive. Bookwire includes links to online versions of Library Journal , Publisher's Weekly , School Library Journal , and many more well known book review sources.