Nancy Pearl is probably the most famous librarian out there. I mean, I even had her action figure. She is the author of the incredibly useful Book Lust books, which are books about books! And now I hear she has a third book out and it sounds lovely, so I wanted to give it a quick mention and link the the Bookreporter.com review.
If you are planning a trip you find the books Ms. Pearl recommends reading beforehand to get in the mood for your destination. Genius!