Aaron Griffin – Fronts are cool because (a) they give you the Goals of the NPC/group/landscape/whatever (which like any good GM you already wrote down) but then (b) they have Portents, and the Portents give you a handy chronologically-ordered list of “What Will Happen If The PCs Do Nothing”.  I don’t run DW, but I love the way they did Fronts.  (By the way, DW explains them much better than Vincent did in AW).