Business Data Catalog is a feature of Microsoft Office SharePoint Server 2007 that allows integration of LOB applications with MOSS. For those who have worked or tried to work with BDC know that the most time consuming part is writing the application definition file. Application definition is done through an XML file that describes the metadata of entities to be retrieved from the LOB system.
Microsoft recently released a tool called Microsoft BDC Definition editor which facilitates creation of this file through a wizard. This tool has been released as part of the MOSS SDK 1.2 release (Aug 2007). To download the tool and learn more about it, please read the following MSDN article: