Don't forget the Microsoft Courier.
Although technically correct, Samsung fails with regard to its poor understanding of product / interface design and aesthetics.
They also forgot to factor in the Apple fanboy culture.
That said, yes, the iPad is a glorified MID.
Look out for HP’s tablet, and also this other thing called the Adam, from Notion Ink - they use a unique Pixel Qi display, which allows the device to function as a long-lasting ebook reader, as well as a full-colour LCD tablet, at the same time.
Don't forget the Microsoft Courier.