OK... Up to now the suggestions include Voightlander Prominent, Fuji GX-680, Sinar M system, the Polaroid instant film, the Kodak Brownie, the first folding camera (does anybody know if it is the Zeiss Ikonta?), the first hand held camera with movements (is it the Linhof?), the Nikon F (because of its completely modular design with finders, screens etc), the Nikon F3 AF (the camera that introduced AF), the original Nikonos & the Pentax Spotmatic (for introducing TTL metering)....
I think we should drop Nikon D1, EOS 30D, the digital Kodaks and the various phones, since there is no revolution introduced for picture talking other than being digital, ergonomics & image quality (which are are all different to revolution in picture taking) and we should also reject the Hasselblad ELM (because the motor is ergonomics, it doesn't affect one's photography)... but I also think we should include the first modular MF ever (was that the Hasselblad 1000?), or consider Hasselblad 500c since it added leaf shutter & polaroid back on top...
If there are no objections, that leaves us with what is on the first paragraph & the Hasselblad 500c added... I think that there are more that can be added, please contribute your knowledge on revolutionary cameras!