What to Send?
Include a press release, press kit or something tangible beyond your book. Editors receive tons of stuff all that time, both requested and not, and they will inevitably look at your item and ask, "Now, why did I get this thing?" The press release, your contact card clipped to the book or a reviewers kit can help them with recalling your materials.
99pr.com
http://www.99pr.com/article.php?story=20050801144859691