Sydney Airport Lounges

The Qantas Club lounge can be found in Terminal 3, opposite gates 4 and 5. Open from 5:15am to 10pm, it can be used by Qantas Club members, Gold and Platinum Qantas frequent flyers and Emerald or Sapphire Oneworld members. It provides a comfortable place to relax with food, drinks, bathroom facilities including showers and a spa and massive TVs. You can connect to the internet using WiFi or one of the dozen PCs.
The Air New Zealand Koru Club lounges are divided into Business and First Class sections. They are located after customs in Terminal 1 near gates 50-63. Access is open to those with a Business Class or First Class ticket, Star Alliance Gold members, or RedCarpetClub cardholders. There is a lovely selection of food which changes according to the time of day, a well-stocked bar and private bathrooms. Internet access, TVs, newspapers and computers will keep you in contact with the rest of the world.
The Singapore Airlines Silver Kris lounge is in the International Terminal, on the way to Gate 59. Open from 5:30am to 3:30pm, it is due to be upgraded soon as part of an initiative by Singapore Airlines to revamp its lounges. It offers the same things most lounges do- food, drinks, internet access, PCs and entertainment.
The Virgin Australia lounge is in Terminal 2, to the right after passing through security. There are food, drinks, WiFi and comfortable places to sit- exactly what you might need whilst waiting for a flight! Virgin Australia lounge members and Velocity Platinum and Gold members may use the lounges with a boarding pass for travel that day. The lounge in Sydney also has a Premium Entry facility. This is available to Business Class and Premium Economy Virgin Australia passengers, and Gold and Platinum Velocity members. It allows direct kerbside access to the lounge, optional valet parking, flight check-in and a dedicated security screening point, making the entire process of catching a flight much more stress-free.
The Emirates lounge can be found in the International Terminal after clearing customs, near Gate 58. It is open to First or Business Class passengers, and Emirates Skywards Platinum or Gold members. The food is top-notch and offers a range of options, as is the bar selection. You can connect to the internet, get clean or relax with a magazine. The lounge is open 24 hours a day.
The Malaysia Airlines lounge is in Terminal 1 near Gate 58, and is open from 6am to 10pm. It offers a bistro, showers, a bar, a muslim prayer room and business centre, WiFi and comfortable areas to relax. There are separate First Class and Business Class lounge areas, and they are open for 3 hours prior to each departure of a Malaysian Air flight. Passengers with First or Business class tickets can access the lounges as well as Enrich Platinum and Gold members.
Regional Express Airlines  has a small lounge in Terminal 2 near Gate 47. Here you can hook up to the wireless or use the PCs, relax in a massage chair, or just watch TV while waiting for a regional flight. There are snacks, tea and coffee available all day and beer and wine after 3pm. Members of the Rex lounge have access to it via an access code and fingerprint scan.

Updated October 2013 by Chris Houston. Information is subject to change at any time.