A page with info about the Effects and particularly some png's / screenshots. To learn more about effects and how to write new ones, check out this page : Inkscape Effects
This will transform one path to another path and optionally change the style too. It appears that you need to convert an object to a path first (Path > Object to path ; Shift-Ctrl-c). You can alter the number of steps used and choose one of two methods.
To use, select one path consisting of only line segments and apply the effect. Kochify will replace the given path with a path that has a copy of the original path in between each two adjacent nodes in the original path. If the original path input has bezier curves, the effect will effectively replace them with lines and then apply the effect. For more information about Kochify from a developers perspective, look here.