Love them, hate them, or love to design them over coffee, DKP systems are overwhelmingly prevalent in raiding guilds. I only recently learned to stop hating them when I saw a forum post that analyzed DKP vs. random rolls and proved that the relationship between number of raids and amount of gear gotten is pretty much the same in both cases, but with less random noise in the case of DKP. My guild uses a fairly simple zero-sum system, which seems to work well (even if I am almost always in the negative). What about you? Where do you stand on DKP, and what DKP system, or what way of distributing loot, does your guild use?