Simply killing them is the best way to do PvP. Killing and being able to loot is what leads to alot of the bad feelings and bad people in PvP. No one wants to go out and quest for the best gear if you can lose it by being ganked by someone higher level or a group of people. No one wants to lose all their hard earned money by the same ways. All you lose in WoW is time, the time it takes to make the corpse run.
WoW has story related reasons for the PvP, you don't just get to kill anyone. You can't kill other's of your Faction for instance.
WoW gives a reason for the PvP. It's faction vs. faction.
As such, there are no rewards for killing someone other then the satisfaction of knowing you've killed a member of the enemy faction.
Edited, Sun Dec 5 23:30:21 2004 by SeomanP