With IDC downgrading its forecasts for PCs and tablets again (see inset), it was no surprise that, at the annual Intel Developer Forum (IDF) in San Francisco, the chip giant was talking about almost anything except the product which has been the seat of its power for so long. Spider robots controlled by CEO Brian Krzanich’s bracelet; a spy camera embedded in an inflatable flying shark; a smart mirror that changes the color of clothes as you try them on; a smart greenhouse – and so it went on. Of course, these wacky demonstrations were designed to showcase very real technologies – which Intel hopes will quickly start to be adopted by the developers of all kinds of products, and…