Dust is officially up for sale on iBooks in the above countries. I am enough of a Mac geek that I find this thrilling (alas, again I must mention it is not for sale in the Canadian store because of "negotiations" etc--I can't even download my own book!).
It has been ten years since the book was released. When I talk to students they often ask me which of my 15 books is my favourite and I always answer Dust. It is the one that I feel "worked" the best out of all my novels.