They've just released their new Game Statistics page. This new page will provide you with up-to-date statistics about some of the most important aspects of World of Warcraft: most sought-after items in the Auction House, most common player-created items, the fiercest killers in the NPC kingdom, most gathered and found items, most looted items, and the most popular quests.
Click here to see more.

These stats are updated daily and you can even do a side-by-side comparison for up to seven days to see how the statistics are progressing, so make sure to check back often!