While it's tempting to treat "resourcefulness" as a trait intrinsic to founders, in my experience it can be a sharp function of the founder/startup fit. When I did YC, I didn't feel resourceful at all, but that's because I was working on the wrong problems. (Don't ask; it was painful.) As soon as I switched to education and technical publishing (the Ruby on Rails Tutorial, started after YC), I was suddenly resourceful as all get-out—and I started to feel unstoppable. I suspect that if I ever do YC again, the resourcefulness transformation will appear miraculous, not because of any change in my intrinsic resourcefulness, but because the new startup will be a much better fit for my interests and abilities.

One could argue that truly resourceful founders will iterate until they find a good fit. That's probably true—and it's exactly what I did. It's just that sometimes the penultimate "iteration" involves shutting the old thing down and starting something new. Chalk it up to my Artix Phase (http://www.paulgraham.com/bronze.html).