Texting & driving; Talking on the phone and reading e-mails; Writing a to-do list while attendng an education class.  These are things we have all done at some point.  While you may get them done,doing the tasks at the same time takes longer, encourages mistakes, or may be simply unsafe!

Timothy Ferris writes in his book "4-Hour Work Week" (a book I reccomend by the way) that if you prioritize properly, there is no need to multi-task.  It is a sympton of "task creek" - doing more to feel productive while accomplishing less....Divided attention will result in more frequent interruptions, lapses in concentration, poorer net results, and less gratification.  He suggests setting 1-2 main goals or tasks each day and to do them separately without distractions.  You'll find you are getting more of the tasks done to move your business forward and eliminating the "busy work".