I'm expecting Apple to announce a tablet tomorrow.<p>Apple has been completely tight-lipped on the matter, and the only thing they've said about tablets is that they don't know how to make a good one.<p>So why am I, why is everyone, expecting a tablet? What evidence is there that should support that expectation? Apart from the question "what else could it be"?<p>And given how much effort Apple puts into keeping things under wraps, how did so many people and media outlets get so convinced a tablet is 'due' from Apple?