Despite the fact that you can view iPad apps in the Australian iTunes store already, it seems you can’t actually buy them if you’ve picked up an iPad from the US.
If you want to download apps for your shiny new iPad from the US you’ll need to set up a US iTunes account, which could be problematic if you’ve already got a heap of apps from the AU store that you want to port and upscale (even though they look like arse). Of course, if you were that desperate to get your hands on an iPad in the first place, you’ve probably got a US iTunes account already anyway.
[Thanks Stupod]