If you have not already heard by now, Autodesk has released "Bonus Pack 2" for AutoCAD 2009. This update includes two PDF enhancements. The first gives you the ability to attach PDF files as underlays. The second includes enhancements to PDF output.
The download is only available for AutoCAD 2009, AutoCAD Revit Architecture Suite 2009, and AutoCAD Revit Structure Suite 2009. Of course it is also only available to subscription customers.
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