Nancy Pearl is the author of Book Lust: Recommended Reading for Every Mood, Moment, and Reason; More Book Lust, and the Book Lust Journal, as well as the model for the Librarian Action Figure!

From wikipedia.com:
Nancy Pearl (born January 12, 1945) is a librarian, best-selling author, book reviewer and was, until August 2004, the Executive Director of the Washington Center for the Book at Seattle Public Library. Her prolific reading and her knowledge of books and literature first made her locally famous in Seattle, Washington, where she regularly appears on public radio recommending books.
Pearl achieved broader fame with Book Lust, her guide to good reading. Pearl's approach to enjoying reading is the Rule of 50 which states "If you still don't like a book after slogging through the first 50 pages, set it aside. If you're more than 50 years old, subtract your age from 100 and only grant it that many pages."
She founded the pioneering and much-imitated "If All Seattle Read The Same Book" project. She has had her face on American Library Association posters and has received numerous awards. Her book reviews appear in The Seattle Times, Booklist, Library Journal, and on the radio on KUOW Seattle, and KWGS Tulsa, Oklahoma.
In 2003 she received an unusual honor when the Seattle-based company Accoutrements created a librarian action figure in her likeness to be sold in their Seattle store, Archie McPhee. Featuring Pearl with a stack of books and a finger to her lips, the doll's "push to shush" action was popular with some librarians and dismaying to others who felt that the doll reinforced librarian stereotypes. Pearl herself said that the shushing aspect of the action figure would determine "which librarians have a sense of humor."
"More Book Lust: Recommended Reading for Every Mood, Moment and Reason", the sequel (published in summer of 2005) also received much acclaim ("a sprightly follow-up"), and was chosen by the Today Show as one of their book-club selections.

Links:
Nancy's official website
Nancy's online community
The Librarian Action Figure
Interview with Nancy in Librarian & Information Science News
Western Washington University interview

From NPR.org:
Books to Make You Miss Work
Books for a Rainy Day
Best Spy Fiction