Between about 8:30pm and 7:00am, me. It's close tthe ideal overnight device. Stick an LED on it and the only things left are better text entry and some browser fixes.
A friend of mine was in dire straits a couple of years ago and had to take up residence in a hostel. She couldn't get a proper Internet connection, so she bought a Kindle just for the free 3G connection.
My grandmother owns a Kindle Keyboard 3G and a netbook, she says she prefers the Kindle because "there are two many things popping up at me" on the netbook.