Commiserations on the blockage. For me, the only thing that's surefire is thinking about how badly I need the money from whatever it is I'm writing. Sometimes, though, if I just start noodling around, outlining a scene or a bit of dialogue, I can fool myself into doing a lot more. I *think* it's because I tell myself that there's no pressure, I'm just noodling around, and it doesn't matter if it's good or not.