Microsoft is making Windows 8 freely available to the public in the form of a Consumer Preview build that anyone can download and install on a PC, as well as on a Macintosh computer.
Although you can freely install Windows on Macintosh hardware without the need of a virtualization app (i.e. via Boot Camp), it’s probably best if you give Windows 8 Consumer Preview a try using a program like VirtualBox, Parallels, or VMware Fusion.
The system requirements for Windows 8 are: 1 GHz CPU or faster; 1GB of RAM or higher; 16GB hard disk space; DirectX 9 GPU or better; Internet access; a touch-screen for multitouch features.
You can download the Windows 8 Consumer Preview ISO image using the link below. There are separate downloads for the 32-bit and 64-bit version, as well as installers for localized versions in Chinese, French, German, and Japanese. The product keys for using the Consumer Preview are available on this page. Enjoy!