A good article in How Stuff Works about Holographic UIs.
"Tele-immersion will blur the lines between real and computer-generated images. It will be the ultimate tele-commuting technology, almost entirely eliminating the rush-hour drive to work. Instead of commuting, people could attend board meetings by projecting themselves into the company's conference room. And if your job requires you to travel, you could still be home for dinner by tele-immersing yourself into the family kitchen. Because this technology is still in the early stages of development, the possibilities are truly endless." Read the Article.