I bought the Nikon SB 900 Speedlight from Harry at the Nikon counter at J&R today. True to its advertising, J&R matched B&H's web price. The J&R staff, in general, are very knowlegeable about the system, which is now almost entirely digital. I bought the speedlight primarily to use on the D200 but I also intend to shoot with it on the F100, though that camera's not part of Nikon CLS.
I want to try photographing faces with direct flash to get the same stark effect Diane Arbus got in her photos, the kind of shots that laid bare the perversity below the surface normalcy. Weegee photographed that way too, and the style was perfect for his bullet-ridden corpses.
To get that forceful an effect, though, I'd probably have to take the flash off TTL and move it manually to a more powerful setting.
