ModuleAdmin is the successor to ModuleInfo, encompassing its functionality, and replacing the default module management functionality for Drupal.
ModuleInfo is a cool module that will help with module management in Drupal. It inspects installed modules and tells you what pages, menu items, blocks, form fields, and content types the module creates.
This is to help with user experience: after one installs a module, one no longer needs to hunt about the UI with the questions "what has changed?" and "how do I configure this module?".