Horde-Alliance Population Imbalance (Score 1)

One of the interesting design decisions in World of Warcraft is the character factions. While it has openned lots of possibilities as far as PvP (eg Battlegrounds) and the Warcraft plotline is concerned, it has had the side-effect of imbalancing the player population. On my server (Silvermoon), the Alliance players outnumber the Horde players 3-1. While the Alliance side has a very active auction house and large pool for raid groups, both of these are much more limited on the Horde side. Also, both factions have been quite frustrated that the Alterac Valley battleground (a new 40-person per side PvP instance) is almost never open as it is rare for enough Horde players to be in the queue.

Is there anything being done to address this imbalance in the Horde/Alliance play experience or to encourage more players to play on the Horde faction?