I really hate this thing. So, eBook are like DVDs - zone 1, zone 2... They are stupid at that point that they even don't understand they are stupid.
Another day I wanted to buy some Umberto Eco's books on Amazon in order to strip DRM and transfer to my Sony (as I already did with some other books I really wanted). And guess what? "Only to a valid US address". Gosh, I am in Canada, 50 miles form the US border, and I cannot download these books.
Not only I have to strip DRMs because none of the formats my reader supports is available but I have also to cheat using some other address, just to obtain an eBook I want. Too much for me.
Too bad for them, they lost money, I saved it. But I miss the books.