Last Christmas season I went to L.L. Bean to order some rain gear and repeatedly watched my computer curl up like a constipated dog every time I clicked on the orderbutton.
For weeks now, Blizzard has been offering pre-purchases of the game online, and you could download Diablo 3 in its entirety before release in order to simply click a button and install on launch day, and customers can continue to buy it through them at any time since then.