Distributions are incredibly important to master limited partnerships -- they are the reason many investors buy in, and ultimately what drive the market performance for this asset class. As news of distribution increases trickle in for the third quarter, Fool.com contributor Aimee Duffy takes a look at the payouts from Genesis Energy (GEL -0.34%), Plains All American Pipeline (PAA 0.95%), and Memorial Production Partners (NASDAQ: MEMP), as all three MLPs are leading the way with the biggest distribution increases.