All the Lore You Need
The third volume of the World of Warcraft Chronicle covers events from the Third War up to the Cataclysm. Lots of details here about Illidan, the Lich King, Thrall and others. It clears up some questions I had but had never bothered to look up, such as how so many Blood Elves ended up in Outland.
Because the book is now covering events that took place in-game, the authors have to take major historical events that were preformed by players of both factions many many times in the game and present them as singular events performed by only one group. As a result some raids are attributed to the Horde and some to the Alliance, even though players of both factions do them regularly. I have to wonder if the authors flipped coins to pick between Alliance and Horde, or if they tried to find legitimate lore reasons for choosing one over the other.