If you have your students do "research" this (or a similar one) is a must read.

In the short five years since the author’s first book was published, searching the invisible web for the hard-to-find, has become even more complex. For young people, especially high schoolers, who are doing advanced research, the teacher librarian needs to have advanced skills in information searching. In these essays, the authors provide not just an introduction to the topic but plenty of examples and tips for using a variety of search engines to uncover items not usually floating to the top of a Google search. So, take a serious look at your own skill level and decide if you have the kinds of skills that make you the magician of finding and locating. This book may just be the ticket to the magical powers you need to stay on top of that mysterious behavior of the information world. Recommended.