Blimey, these were available in Aus over a month ago.
A bit late on this news.....
I picked up an 640Gb SE in Melbourne in the middle of Feb for the bargain price of $79 aus - it was a return since some bloke had claimed it was 'missing' 40gb rolf!!!
Also the windows ones work perfectly in a mac once reformatted (including the password protection) the windows drives even have the mac wdsmartware / annoying virtual cd on them which can - or rather *should* be disabled cos' it sucks).
Anyways the 1Gb were on the shelves at the same time with 'ouch' pricing. The interesting thing is that you can't crack these externals open for use in other things - no sata connection AT ALL - purely usb on the drive - first time I've ever seen that.