Yesterday I discovered that Excel Services' Trusted Locations don't use the Alternate Access Mappings collection from MOSS 2007 to grant or deny access to a workbook inside a SharePoint Document Library.
I did a search on the Web and apparently it is already a known issue:
Excel Services will not load workbooks from sites that are mapped to internal sites that are listed as trusted locations in SharePoint Server 2007
UPDATE:
This issue has NOT been fixed in Service Pack 1
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