[development] update/replace the book module - poll, questions

We're hoping to have a replacement for the book module that will be more general for creating a hierarchical site structure. What should such a module be named? Poll here: http://groups.drupal.org/node/3941 joshk indicated a willingness to be involved in the coding, but we really need feedback on what kind of UI such a module should have: http://groups.drupal.org/drupal-dojo/book-project Also, a question- any suggestions for how the upgrade/install path should look (at the code level) if the module name changes? -Peter