BookBrowse: Reading Group Guides - Reading Group Guides for many of the best recent books. New guides added weekly. Plus an excerpt of each book, reviews, interviews, author biographies & book jacket summaries. - http://www.bookbrowse.com/reading_guides/
Penguin Classics - Reading guides for Penguin classics, including teachers' guides and suggestions for starting reading groups. - http://www.penguinclassics.com/
Simonsays.com - Reader's guides from Simon & Schuster - includes author appearances, e-mail updates, and discussion boards. - http://simonsays.com/
Harcourt Trade Publishers - Reading Guides for books published by Harcourt Trade Publishers and Harcourt Children's Books. - http://www.harcourtbooks.com/BookSearch/readingGuides.asp
Harper Collins Reading Group Guides - UK - Site for digging deeper into books you've loved and gaining insights into books you might like to try. Packed with extracts, interviews and competitions. - http://www.readinggroups.co.uk
Bookclubs.ca - Search and browse for reading guides by author or title, read author interviews and excerpts, links to club sites, and recipes for reading group meetings. - http://www.bookclubs.ca
Ballantine Reader's Circle - Featured reading groups selections, tips for reading groups, and e-mail newsletter subscription. - http://www.randomhouse.com/BB/read/
St. Martin's Reading Group Guides - Publisher's Reading Guides for St. Martins Press, Griffin, and Picador USA. - http://www.stmartins.com/smp/rgg.html
Norton Reading Group Guides - Online general interest reading group guides from W.W. Norton & Company - http://www.wwnorton.com/trade/rgg.htm
Henry Holt Reading Guides - Online publishers guides from Henry Holt, Owl Books, and Picador - http://www.henryholt.com/readingguides/index.htm
ReadingGroupGuides.com - Complete reading group resource - provides nearly 1,000 guides from a variety of publishers, searchable by author, title and subject. Separate sites for kids and teens. - http://readinggroupguides.com/
Houghton Mifflin Reader's Guides - Reader's Guides for books published by the Trade & Reference Division of Houghton Mifflin. Printer friendly versions available. - http://www.houghtonmifflinbooks.com/readers_guides/
Vintage Reading Group Center - Reading group guides for every interest: from fiction to memoirs, award winners to bestsellers. Fully searchable. - http://www.randomhouse.com/vintage/read/rgg.html