The Business Data Catalog Definition Editor has been included in the newest release of the MOSS2007 SDK.  It has been designed to assist in the lifecycle management for Application Definition files.  The tool enables searching over databases and web service-based repositories, as well as the connection for BDC web parts in MOSS. 

http://www.microsoft.com/downloads/details.aspx?familyid=6d94e307-67d9-41ac-b2d6-0074d6286fa9&displaylang=en

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