Is CubicNavigator intended to replace the QuickTime plugin for viewing QuickTime VR movies?
No. The QuickTime plugin allows QTVR movies to be embedded in web pages where they can appear alongside text and images with information and other material. CubicNavigator includes an OpenGL based viewer which shows purely panoramic content, and is intended for showing it in a more “deluxe” way: for smoother viewing, fullscreen, as a slideshow, etc.