The modular architecture for Audacity that allows GUI plug ins has now been adopted by the main Audacity project. Version 1.3.8 (beta) of Audacity has the required structure. The scripting plug-in that was first prototyped here in Audacity-Extra has been extended. Show stoppers (no error reporting) that previously prevented serious use have been fixed by Dan Horgan as part of Google Summer of Code 2009.
Hijacking of Audacity - to completely recast the look and feel whilst using the same underlying code and the EDI version of Audacity, particularly the new widgets written for that, are still only available here.