If an iPad isn't to be a retrograde step, it will have to offer some serious computing, too (especially if it's to compete in the netbook market). It's hard to imagine touch-typing where feedback is everything on a glass screen. And Steve Jobs has been pretty clear, in the past, that offering cut-price computing doesn't appeal. "We don't know how to make a $500 computer that's not a piece of junk," he said last October. It's an unlikely ad slogan.On why the Apple rumour mill's turning to quickly, for The First Post.