These systems are the most powerful, ultra-portable Linux laptops you will find. They weigh from 2.6 to 3.5 pounds and are super thin, much smaller than your O'Reilly books. These laptops have excellent ergonomics; their super-bright displays (12" or less) have at least 1024x768 resolution, and their keyboards are nearly full-sized. They are very quiet and don't generate much heat.