Reading the latest improvements made to the system, this one looks awesome -

http://qantas.com.au/info/flying/atT...ort/quickCheck

"If you arrive early to check-in for your flight you now have the option to change to an earlier flight.* Simply select the 'Check availability on earlier flights' option and you'll be presented with a list of available flights up to five hours earlier than your original flight, but not inside 30 minutes"

Less human interaction - woohoo!

Next step is to get upgrades from it =)