All the World's a Stage, and all the orcs and humans merely players. They have their stories and their characters; and one player in his time plays many roles.
Some time ago, I had my first look at Warhammer Online, and wondered if that game treated roleplaying any differently from World of Warcraft. I wrote at some length about the significance of a written warning whenever someone signs up for a roleplaying realm for the first time, but I also noticed that Warhammer actually had another very special feature that could be beneficial for WoW roleplayers, namely the "Tome of Knowledge." Playing around with this a little bit made me think about how Blizzard could make something similar, which would go a long way toward enriching the experience of the game, not only for roleplayers, but for all players. Warhammer's Tome of Knowledge is not without it's flaws, of course -- I can surely imagine a better one for WoW to adopt, but at the moment WoW has nothing at all like it, which is unfortunate.
But what is the Tome of Knowledge? Basically, it's is an in-game database full of all kinds of information you might be interested in. This includes gamey things like achievements, titles, and quests, but also contains a lot of info about the story and lore of the game, such as some history for each major region, descriptions of noteworthy persons, and a bestiary of all the enemies in the game. When you visit an important location, encounter an important questgiver, or defeat a new enemy in battle, information about that entity will appear in your Tome of Knowledge. A little popup will even let you click through to it right away.