Apple’s last and best announcement at the Macworld Expo, was its hotly rumoured three-pound laptop, called the MacBook Air ($1,800). Apple says it’s the thinnest laptop in the world, and no wonder; this thing looks like it’s descended from a spatula.

It's a rock concert! It's a pep rally! It’s a news conference! No, it’s the Macworld Expo, the annual four-day trade show in San Francisco, where Apple introduces its latest products before adoring crowds.