Microsoft has made "limited stock" available of its Windows 7 Family Pack in Australia.
The Family Pack, offered for AU$249 RRP contains three 32- or 64-bit licences of Windows 7 Home Premium, and is sold through a number of retailers including Harvey Norman, Dick Smith Electronics, JB Hi-Fi, Officeworks, Myer and David Jones.
Unfortunately, these are upgrade licences only — you'll need to have three PCs with Windows XP or Vista installed on them.
Those who had already purchased three Windows 7 upgrade licences before today's launch aren't totally left in the cold. Microsoft has announced that those people are eligible for three complimentary Microsoft Wireless Comfort Desktops, and will just need to phone Microsoft Customer Service on 13 20 58 and have proof of purchase in the form of a receipt.