WoW is offering more free character transfers, in order to alleviate some server population issues.

We will be offering free character moves from selected high population realms to lower populated realms, assisting in population dispersal. The ability to move a character on the selected source realms will become available on Friday, January 4 at 12:01 PM PST, and are scheduled to run until Friday, January 11 at 12:01 PM PST.

In the event that a realm meets our transfer goals before the scheduled end date, the transfers to that realm will be disabled. We highly recommend that if you are planning to transfer that you do so at your earliest convenience. No characters will be eligible for these free moves once the transfers have been closed.

Here's the entire list of servers you can move to, and complete informtion.