It\'s not an add-on. It\'s a glorified memory card being made by IBM, not Nintendo.
And it wouldn\'t have to be 1GB. They could chop the size in half to reduce the cost, mass produce it to reduce the cost, and wait six months to reduce the cost and it\'d be affordable.
Obviously, no gamer would pay $500 for memory.
No games will be planned to use it exclusively unless it takes off, so for now it\'s just a big memory card... As far as I can tell.
-Eik