In addition to the included "AutoCAD 2006 Getting Started Guide" in the AutoCAD 2006 shipping product is a card. The card offers a selection of printed guide books where you can request one free for each license you purchased.
The four offered books:
AutoCAD Customization Guide
AutoCAD Network Administration Guide
AutoCAD ActiveX & VBA Developer's Guide
AutoCAD User's Guide'
You can also request the one printed guide per license on the web at http://www.autodeskbookrequest.com
All the content from the guides are also included in the AutoCAD 2006 Help.