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AutoCAD 2011 and many other products are now available to Autodesk subscription customers as well as anyone wishing to download a fully functioning 30 day trial version.
The 30 day full trial products are available for download form the product pages such as from the AutoCAD page http://www.autodes.com/autocad located on the right side of the web page.
The default for most Autodesk Subscription customers is download but you can easily request free physical media as mentioned previously “Downloads to be Default for Subscription Software Delivery March 12, 2010”.
Between the Lines - Autodesk blog by Shaan Hurley