The Assumptions to the Annual Energy Outlook 2006 report is available in PDF format only at:
http://www.eia.doe.gov/oiaf/aeo/assumption/index.html

The Assumption to the Annual Energy Outlook 2005 Report has been archived and is available at:
http://www.eia.doe.gov/oiaf/archive/aeo05/assumption/pdf/0554(2005).pdf