Working on your DupliFrames tutorial, huh? Great Stuff
I think the tool tip is interpreted as " being used in a static application /ignore the speed ipo curve and make all the dupliframed objects evenly spaced", as opposed to an animation application where you want the object moving in an ease in/ease out movement (Such as a case where you might be animating a car moving along a path - you wouldn’t want the car to snap from 0 to 60 mph at the start and 60 to 0 mph coming to a stop, now would we ).
A quick example:
[>] Default Scene
[>] Add Curve>Path and scale it by 10; switch to Object mode
[>] Parent the cube to the path, Select “Normal Parent” from the Popup menu, clear the origin of the cube (Alt_O) so it snaps to the start of the path
[>] Switch to Object Buttons [F7] and with the cube selected activate ‘Dupliframes’
[>] Way too many Cubes to see what is happening, so increase the ‘DupOff’ setting to about 10 to 12. Notice how at the start and end of the path the cubes are closer together - that’s because of the ease in/ease out speed ipo curve of the Path (which you can view in the IPO curve Window)
[>] Now press the ‘NoSpeed’ button and see how your DupliFramed objects are all evenly spaced. (You can turn up the ‘DupOff’ setting a bit, if you’d like). Basically, a quick way to create evenly spaced objects like railway ties, highway curve posts, etc.