Intel's seen the future of the laptop, and it's called the ultrabook. Designed to compete head-to-head with the MacBook Air, these new machines are extremely thin, promise over five hours of battery life, and boot / resume from sleep very quickly. Every major laptop manufacturer now has an ultrabook on its product list, so whether you favor Acer, Asus, Dell, HP, Lenovo, or Toshiba, there's a review here for you.