I am trying this spec on my warrior, cuz it seems really good for pvp:
http://www.worldofwarcraft.com/info/...00000000000000
Please note that I've chosen sword specialization cuz I play a human warrior and I personally love the extra attack chance, but you can put those 5 points in any spec you like.
And I sacrificed 1 point from improved battle shout to activate piercing howl, which is very useful in pvp battlegrounds.