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If I'm remembering correctly, when the ASTC conference was in San Jose 
there was a reading exhibit done by Zerox/Parc that had a neat way of 
doing a timeline.  It was a flatscreen monitor visitors could slide 
along a rack geared track.  The images would change with the location 
of the monitor sliding across the timeline.  It's a nice amount of 
visitor control, very enticing to get across whatever it is you want to 
present.  I talked to someone there who helped build it.  They said the 
biggest technical challenge was a dampening system so the teenagers 
among us didn't wind up and slam it into the end. 
   

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