The bottom line is that anelevatorpitch is extremely important and worth taking the time to develop so it is easily understood and projects exactly what it is that you do.
An elevator-pitch definition of service oriented architecture would be: Loosely-coupled services with well-defined interfaces that provide business functionality and can be shared or reused across and beyond the enterprise.
It is a popular concept -- earlier this year, students at Columbia Business School took part in a pitch competition in which the pleas for investment were actually delivered in anelevator, although these were filmed rather than having all the judges crammed inside as well.