I love showing this one off in class, "Alright everyone, switch to your map workspace. Cool, now switch back to the Civil 3D workspace." I then wait for someone to mention it and I make fun of Autodesk.
Control-9 toggles the commandline on and off or you can type COMMANDLINE.
Brian Hailey
http://www.cad-1.com
http://www.AtYourDeskTraining.com
http://Civil3DPlus.wordpress.com