I did not find something like this in the addon repository and thought it might be useful i.e. for tank track animations,etc.
The script automates the task of creating linked duplicates of an object with a follow-path-constraint and adjusting their offset values to line them up on a path.
It checks first if you have selected an object and if this object has a follow-path-constraint with a valid target curve applied to it. If this check fails you won't be able to call the operator.
positive offsets will move objects backwards on the path - negative offsets will move objects forwards on the path
Note: Using 'evenly spaced' with non-cyclic splines the original object is supposed to have an offset of 0.0.
UPDATE: The current source files can be found here.