I know that for most of you this is pretty boring information but for me it's a major step forward.
From the Qantas industry sales site.
latest qantas news international advance seat selection & international online check-in 18 june 2009
Qantas has introduced international online check-in and advance seat selection, expanding the range of services available to customers.
international online check-in
Customers whose first sector of their itinerary is on a Qantas operated and marketed flight can check in and print their boarding pass between 24 hours and 2 hours prior to their flight departure. Customers may also enjoy a faster airport experience with dedicated online check-in counters for bag drop and visa checks.
international advance seat selection From 18 june 2009, chairmans lounge, platinum, gold and silver frequent flyers travelling internationally will be able to request a seat via Qantas.com once they have completed their reservation. By logging on to "manage your booking", eligible frequent flyers will see a 'select seats' button which takes them to a seat map showing available seats to request for their international booking.
Please note for any Qantas domestic travel, a seating preference panel will be displayed on Qantas.com with the opportunity for eligible frequent flyers to enter an aisle or window preference for a domestic flight number.