Hi,
I should probably introduce myself. My name is Robert Kerr, and I am 
a Doctoral candidate at the University of Oregon studying political 
geography. I have been intrigued by the quest to find a foto of the 
boundary point shared by Germany, France, and Switzerland...and I 
think I have found an interesting url.  It is for the region of 
Dreilandereck, which is, I believe, the local name for the boundary 
point.  Since the actual point appears to lie in the Rhine, the 
placement of this monument interesting.
http://www.kant.stepnet.de/weil/dreilae.htm
Rob
Robert M. Kerr
Department of Geography
University of Oregon
Eugene, OR 97403 USA
(541)346-4856