This document outlines how to connect an Oracle10g database on Linux x86 to a SQL Server 2000/2005 database.  Note that this does not work on x86-64 or pure 64bit machines since an important Oracle file is empty.  Make sure to test this on a test machine first and NOT on a production server until you are satified that it works properly in your environment!  Click on the following link to view the document: Connecting Oracle to SQL Server.