We’ve just released a beta for a new tool called Batcher.
Batcher can enhance a wide range of existing InDesign ExtendScripts (CS3 and upwards), and make them work with drag/dropped documents, book files or even whole folders.
Instead of the tedium of having to open each document in turn, then running a script, save, close… you can now simply drag/drop a multitude of documents onto an icon, and Batcher will process them with a designated ExtendScript.
More info here: