One of the most important commands for any AutoCAD user to know is eTransmit. This allows you to gather all the information required to send a set of drawings to someone else including xrefs, fonts style, ctb files and printer pc3 files. You can also use eTransmit to archive a set of drawings, bind multiple drawings with xrefs and purge multiple drawings.
I have created a short video tutorial explaining the basics:eTransmit Basics
