i lifted this from another forum :
"Ok some know they you can't not make a Alliance and Horde on the same pvp world. Here the thing level a Alliance or Horde to 20 then Delete him then make a new alt on Alliance or Horde what ever you made.
Then ask the GM that your main got delete give them any story. After your main get's undelete you have Alliance and Horde on the same pvp world and the same acct.
As I know on my world some one have done it."
anyone have any comments on this? id love to have an alliance and horde on my server. i have lvl60 lock alliance, and would like to lvl up a horde char on the server, and be able to fund him via tanaris AH trick :P