Project: Blender Extensions
Tracker: Py Scripts Contrib
Author(s): Jason van Gumster (Fweeb)
Script name: Edit Linked Library
Wiki page: http://wiki.blender.org/index.php/Extensions:2.5/Py/Scripts/Object/Edit_Linked_Library
Category: Unstable (example)
When working in larger projects that involve scenes with assets linked from a .blend library, it can get very time-consuming to save your current scene, track down the proper linked .blend, make your modifications, save, and return to your original scene file. This add-on allows you to accomplish this process with only a pair of mouse-clicks (one to get to the linked library and one to resume work on your scene).
Script works great for linked groups. Would be nice for future versions to support regularly linked objects as well as proxy-fied rigs in a linked group.