CAD Forum is a Web site in the Czech Republic with thousands of tips for AutoCAD users.
One recent tip describes how to see the easter egg hidden in AutoCAD 2005:
In the Layer Properties Manager dialog box, hold down the Shift+Ctrl keys, and then click on the "Inverse Filter" option. A dialog box appears with the names of the Autodesk development team in Matrix style (but in Autodesk blue instead of CRT green). Right-click to control the display.
The site also describes how to access easter eggs in ADT, Revit, and other Autodesk software.