Assassin’s Creed (google for DRM related on this). Diablo 3 (you most likely cannot play offline single-player without being online. sigh. Although in Diablo’s case it’s less about DRM and more about in-game purchase greed). NHL goddamn ’12 (at least you cannot play HUT mode if servers go away, and also the game jams every now and then, which I paranoidly suspect DRM – I can go totally wrong).
All these game share common thing, which I call a bug and some business men claim to be “a feature”.
I’m suspecting that the same reason why not all books are made digital is the fact that publishers are afraid of piracy. I’d actually re-buy several of my books if only they were available for Kindle. I’d gladly pay even bit more (although I think fair’n'square option would be to have same price for both physical and digital books) if they would be available.
Back to dreaming.