Will we have computer displays that project holographic text and
images, similar to Princess Leia's message to Obiwan in Star Wars? 
What would be required to make this happen?

We are getting close. They do have holographic dispalys much like a
cowboy and indian video game i played when i was a kid. But the army
is working on a display that produces 3d images. The monitor is
actually a big circle....reminds me of a crysal ball. Anyways to the
point you can look at the objects in it from all angles. I will see if
I can find some links.

Name:  Time Traveler 
Year:  1991 
Genre:  Adventure 
Class:  Coin-Op 
Sub-Class:  Arcade 
Manufacturer:  Sega 
Resolution:  CGA 
Orientation:  Horizontal 


http://www.ggdb.com/GGDB/Details.asp?VID=3113&Cat=TechRoot.Manual.VZ

Army Research Lab Places Order for New Perspecta Spatial 3D Platform
from Actuality Systems
Maryland Research Facility will Explore Possible Military Role for the
Unique 360-Degree Domed Display

SAN FRANCISCO, Calif. -- June 25, 2002 -- Actuality Systems, Inc., a
leader in spatial 3D visualization technology, announced today that
the U.S. Army Research Laboratory (ARL) in Adelphi, Md., has placed an
order for Actuality's Perspecta platform and will be among the first
to receive Perspecta v1.5, the spatial visualization platform just
released last week.

http://www.actuality-systems.com/