It seems like yesterday that we reviewed the inaugural Samsung Series 5 Chromebook running Google's Chrome OS, an operating system for laptops based on Chrome. It was, from the start, a world in which everything from music playback to document creation happened in browser tabs. Since we last checked in a year ago, Google has addressed some early complaints -- the browser can actually stream Netflix now! -- but it's only just getting around to ticking off some other long-standing grievances, like multitasking. The company just a