The OpenOffice.org SDK is an add-on for the OpenOffice.org office suite. It provides the necessary tools and documentation for programming the OpenOffice.org APIs and creating own extensions (UNO components) for OpenOffice.org.
The online available Developer's Guide (wiki) is a comprehensive guide that provides a detailed description of the OpenOffice.org API concepts, the OpenOffice.org UNO component model and how to use the API in the context of the different application areas. Most of the examples are coming as ready to build examples with the SDK and provide a good start point tom play around with the API.
SDK related questions and comments should be sent to the SDK mailing list. Bugs and requests for enhancement should be reported as IssueZilla issues. Developers who are new to OpenOffice.org will also find the OpenOffice.org development page useful.
A further useful extension to the SKD is the OpenOffice.org API plugin for the NetBeans IDE. The plugin helps a lot to get started and take the first steps. Several wizards can be used to create completely ready to build and ready to use projects for new OpenOffice.org extensions or simple client applications. You can install the plugin directly from within NetBeans via the plugin manager. The plugin depends on an installed OpenOffice.org 3.0 and a related SDK version.
If the links above do not work then please download the SDK from the archive.