Windows 8.1 now available

If you have a Windows 8 device, you can download the free update to Windows 8.1  through the Windows Store. If you have a device running Windows 7, Windows Vista, Windows XP or the Windows 8.1 Preview, visit Windows.com, which will detect your OS and provide you with the information you need to get Windows 8.1 on your device.
Starting Friday October 18th, Windows 8.1 will also be available on new devices and as a  DVD product

Windows 8.1 now available! TechNet

Getting started tutorials for Windows TechNet

Exploring Windows 8.1 Start Screen and Start Button Options and Configurations TechNet

Windows 8.1: One Vision, One Platform for everything you do at work

Windows 8.1 support forums

Microsoft starts rolling out Windows 8.1  ZDNet

What's new in Windows 8.1  ZDNet

Windows 8.1 includes seamless, automatic disk encryption—if your PC supports it   arstechnica

What's new in Windows 8.1 (pictures)  CNET

Windows 8.1 Tutorials nirmaltv

Windows 8.1 brought a buddy to the Windows Store: An official Facebook app PCWorld

The 'start' button is back: 16 features of Windows 8.1 cbcnews

Windows 8.1 review The Verge

Review: In Windows 8.1, Mail is finally usable on tablets and desktops  arstechnica

How to prep your business for Windows 8.1  PCWorld

Windows 8.1 review: The great compromise  PCWorld

Windows 8.1 is here: What you need to know  PCWorld

Upgrading to Windows 8.1: Your new OS survival guide  PCWorld

Windows 8.1 released: How to download for free, and a guide to the new features ExtremeTech

Restore Libraries in Windows 8.1  betanews

The five best new features in Windows 8.1  gizmodo