Being a World of Warcrafter, this makes a good read.

Blizzard reveals full scale of World of Warcraft operation

Blizzard has revealed the full scale of its World of Warcraft operation, from the number of computer systems it uses (20,000) to the amount of people it takes to create the game’s numerous classes, items and levels (37 – who have created some 70,000 spells and 40,000 NPCs since the game’s launch five years ago).

Blizzard reveals full scale of World of Warcraft operation // News