I've found at least three multiboxers on Sporeggar-EU (RP PVP), converted one to play with two accounts (just trial for now) and one is considering trying dualboxing. Plenty of bots to kill for practice. The alliance isn't going anywhere in PvP or PvE though, they are far behind the horde in raiding and pvp skills, the best they can offer is a Crossroads raid :/

(In an invite-only guild (sort of) with my old friends from February 2005 era WoW. The server was made after TBC appeared so that's why I'm bringing up the status. Horde's doing SSC and taking steps into TK by the way.)