A very clever Greek I know, Konstantinos Chandrinos (<color><param>0000,0000,8000</param>[log in to unmask])</color>, has done
lots of work on precisely this sort of thing, and his results certainly approach the "sci-fi"
scenario mentioned by Tobias.
I have contacted him (he is not on this list) and he invites anyone interested to have a look at
<underline><color><param>0000,8000,0000</param>http://www.iit.demokritos.gr/~kostel/papers,</underline></color> in particular the item