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VRex 3d Stereoscopic Solutions provide just that - stereoscopic solutions. They have some really bright ideas, such as doing an IMAX-like stereo presentation or making company's brochureware in 3d, anaglyph glasses included. A 3d billboard sounds interesting, too.
More:
Attend a conference on Stereoscopic Displays and Applications XVI (2005), January 17-19, 2005.
See Actuality Systems' gallery of truly 3d, although not yet big enough, displays.
Keywords: stereoscopic advertising, 3d advertising