And also where...
You gain all of the advantages of a clamshell style PC. In fact, you gain the best of both worlds without kludgy "convertible PC" style solutions. I've got a real tablet, that is as thin as an iPad 2, and I've got a full fledged netbook that offers almost all of the expandability one would expect there. And it costs less than the new iPad. But it doesn't look as pretty.