>We upgraded our production server from 2000 to 2005 this weekend. I noticed today that a certain procedure seemed to stop working as it did in 2000.
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>In this procedure, a value was returned using the RETURN statement within a BEGIN...END block, but the rest of the contents of the block was execute properly. Now it seems the RETURN statement terminates the block and promptly returns the value. Does this sound right?

The RETURN staement terminates stored procedure execution immediately and returns specified value, if any. AFAIK, it works the same in SQL 2000 and SQL 2005.