It doesn't apply if you have already issued the tickets, and use the date booked on the ticket.

However, it seems that after 1JUL08, even if you have already issued the ticket, if you 1. change the date of the ticket to depart on a date after 1JUL, or 2. change the flight number on a flight that departs after 1JUL, or 3. make a reservation using an open ticket onto a flight after 1JUL, such changes will require the payment of the difference in the surcharge.