The two core components of obtruder are the interface and underlying support. The underlying support has been ready for a while and the interface is now more than half done. The missing piece of the interface is the ability to configure which obtruders load in which applications. That is not essential so after a little more cleanup alpha will be available to download.
The back end has been done for a few weeks. The interface (a preferenec pane) is over half done. Another session or two and it should be ready for public consumption.