Of the tens of thousands of shots I've taken, film or digital (of which at least 30 or 40 are worth a damn), my belief is that Tri-X has saved my bacon more often than not. It's taken the most mundane setups and made them worth looking at, and my good ones great. 400 was my favorite, and I used it for everything, from photojournalism to portraiture to art shots. Darn near the perfect film. What was your favorite?