How to Update to Windows 8 1 from Windows 8 for Free

Mungo Darkmatter shows how to update Windows 8 to Window 8.1. Windows 8.1 is a free update.

How to Install Windows 8.1 Preview on a Virtual Machine

Mungo Darkmatter explains how to install Windows 8.1 on a virtual machine so you can test drive it before it comes out without messing up your PC.
Windows 8.1 Preview:
http://windows.microsoft.com/en-us/windows-8/preview
Windows 8.1 Preview ISO Image:
http://windows.microsoft.com/en-us/windows-8/preview-iso
VirtualBox:
https://www.virtualbox.org