I am interested in adding a plugin architecture to the rails app I am writing, and I was wondering if anyone had any good ideas of how to implement this, or pointers to projects that have already done this. "plugin" is obviously a popular word in the rails community, so searching isn''t much help. The basic requirements are that the app plugins should be able to extend functionality (like add behavior or state) and modify the user interface. The first one is obviously simple in rails, but I want to be able to do it in a "safe" way, so that plugins can''t clobber each other. In statically typed languages, you would just implement this by creating an interface, registering plugins that implemented that interface, and calling those plugins at specific extension points. Would this be the best approach in rails? I''m interested to hear if anyone has any thoughts or examples. Thanks, Brandon