Autodesk Labs released the latest Plugin of the Month for October.
The LinkParameters add-in allows Inventor users to easily create dependencies between parameters of various parts and sub-assemblies in the context of the top-level assembly in which they reside. Users are able to select visually a parameter from a source component and affect its value to a specific parameter in a target component. The add-in is based on the iLogic functionality introduced in Inventor 2011. It automatically generates the iLogic code required to link the values of the parameters, without the need for the user to write any iLogic instructions.
It is supported by the following releases: Inventor 2012, 2011.
Also, if you want to look back at older Plugins of the Month, here is the link.