We've already heard rumors that chip designer ARM has been trying to get its wares into the Macbook Air. While we can't add anything to that particular story, we do have further evidence that ARM is going beyond smartphones and tablets in order to target bigger form factors. The company's president, Tudor Brown, has just appeared at Computex to declare that ARM wants to conquer the "mobile PC market", where the company currently only has a 10 per cent share. He's aiming for 15 per cent by the end of this year, and an Intel-provoking 50 per cent by 2015. "Mobile PC" is a pretty ambiguous category, but