I have written an a chapter about popular science readers' advisory for a book being edited by Jessica Moyer. At Jessica's request, it takes an interdisciplinary approach, recommending media as well as books for people who enjoy learning about science. She is calling the book Integrated Advisory Service: Breaking Through the Book Boundary to Better Serve Library Users. Look for the book in Spring 2010.
I mention this now because I just read an article in the May-June 2009 issue of Sierra that is in the same spirit. Richard Conniff write about some of his favorite books and DVDs about nature and wildlife in "Critter Encounters: Exploring Our Fascination with the Animal Kingdom." He even includes two titles that I recommend: American Buffalo: In Search of a Lost Icon by Steven Rinella and Wesley the Owl: The Remarkable Love Story of an Owl and His Girl by Stacey O'Brien. Another old favorite that he suggests is My Family and Other Animals by Gerald Durrell.
The "Mixed Media" section of Sierra often has good reading recommendations. Also watch the back pages of Audubon to find popular science titles.