That image up there is the latest developer version of Google's Chrome OS, which now comes with the option of a boring old taskbar icon list, just like every version of Windows since before half of you lot were born.
Google has at least given it a fancy name, though. It calls the redesigned UI system the Aura window manager, which comes with this new lower "Shelf" icon tray, featuring standard Windows / OS X auto-hide options and letting you pin apps to it for easy access. Just like you're using a desktop OS.
In the unlikely event you're running Chrome on a Samsung Series 5 or Acer AC700 Chromebook, this new build's available for those using Google's developer channel preview releases. [Geek.com]