So I was just horsing around with my SB-800 off-camera and doing a bit of an experiment. I was under the impression that the flashes had to be within line of sight from the camera to operate, but I wondered if perhaps the flash would work as long as it was able to see the light coming from the flash on the D300... and it appears that it does. I was able to stick the flash behind a variety of things, including some pretty dark corners, and it still seemed to work without a hitch. Am I losing my mind, or is this actually a viable way to do it? If so, it makes the wireless without radio triggers thing reasonably viable in a lot of circumstances, which is really cool.