Here they are in no particular order of importance:
An advanced wizard which walks you through 6 pages of options to generate any custom post type that you might need.
Another advanced wizard to generate your taxonomies. 6 pages and over 40 options available makes this the best taxonomy generator out there.
Generate a boilerplate WordPress plugin to get your new plugin idea up and going! The code that is generated is based on Tom McFarlin’sWordPress Plugin boilerplate code.
Generate the MySQL queries that you need to run on a WordPress database to migrate over to a new URL. It generates a couple MySQL statements that you can then easily run on your database using PhpMyAdmin or a similar tool.
Have any other ideas for a WordPress generator? Let me know.