1. pick up the nearest book to you.
2. find the 123rd page
3. Find the fifth sentence.
4. Post the text of the sentence in your journal along with these instructions.
5. Don't search around and look for the "coolest" book you can find. Do what's actually next to you.
In addition, many of these places are essential end points for quests and hiding places for unique enemies.
World of Warcraft Collector's Edition Manual.
Yes, I'm a geek!