Full Disclosure: this WAS written by a libraryland friend of mine, but I think it counts as unsolicited...
Booklist: A New Reader's Resource: http://bookgroupbuzz.booklistonline.com/2009/08/01/a-new-readers-resource/
Readers' Advisory Goddess Kaite Mediatore Stover says:
"I’ve found a new tool to help me select books for my book groups and prepare in advance for the meetings....this book is a great help for book group facilitators. Rebecca’s book does what I want other books to do. Gathers popular authors who are current favorites with book club members, provides lists of works, some readalikes, and resources to hel0p boost the discussion."