A technique similar to HDR, taking several different shots at slightly different focus positions and then blending them together so that the depth of field is dramatically increased. Nice results, but I'm still mulling over the artistic rules: is it cheating?

Update after a few comments: Thanks to everyone who has replied to my cheating question in the comments. I think I am asking myself about it because I have always been a Cartier-Bresson "decisive moment" kind of shooter: the goal is to find that single sublime instant that captures the essence of the subject. If we use several shots that we stitch together, is that still a decisive moment? Of course, I can ask myself these questions because I am an amateur -- if this was my job and and only way I could satisfy the requirements is to use focus stacking, I'd be doing it without hesitation ;)