If you don't remember from the initial hubbub, here's how it works: if you're a Prime member, you can order one of the branded buttons, which you then connect to your home's WiFi network and stick near wherever the corresponding item is used. When you run out of it, press the button and the item is rush delivered.
If you're content to bend the knee to Lord Amazon and its 18 (as of launch) corporate followers, order yourself some Dash buttons for $4.99 a pop. If you hate rampant consumerism, lament our once great society with weeping. If you don't really care, pat yourself on the back, because that might just be the appropriate reaction.