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As I'm sure you're aware, the TV and movie content owners in Australia have really dragged the chain on selling their content online.
Pay TV operators tend to do this a bit better (I remember paying a couple of pounds per movie for a download from our ISP/pay TV provider NTL in London way back in 2000/2001. But what if you don't want a pay TV subscription just to download movies on demand?
Even Apple's iTunes store lets us down in that department, which is why their launch of Apple TV seemed so hollow - why get an IPTV box when they won't sell you the "V" to watch with it?!
I just read a post from Last 100 which gave an overview of 11 (count 'em, 11) video download services in the US. Of course they're mostly US only, but the article did mention a couple which sell globally.
Jaman specialises in independent and world cinema rental/purchase for Mac/Windows - and claims to be working on a hack to allow it to work with Apple TV.
I'll definitely be checking out Hungry Flix - which specialises in non-DRM independent and niche videos. The writeup says it's "radically different" to other offerings:
"All videos are offered as non-DRM’d MPEG4, so as to be compatible with both Mac, PC and Linux, as well as many portable devices, media extenders and set-top-boxes, and the service specifically targets portable media players such as Apple’s iPod or Sony’s PSP."

Video Download Stores Compared