Get a glimpse of Microsoft's new operating system by trying the pre-beta version of Windows 8 for developers. Though, it is nowhere near finished and should not be used in production environments, it would be quite interesting to know where Microsoft is heading with this new generation of Windows. You have the ability to try out both the touch-centric 'Metro' interface (if your hardware supports it) and the traditional desktop, while you can try it on both 64-bit and 32-bit machines. The Windows 8 Developer Preview can be tested on the same hardware that runs Windows Vista and Windows 7:
Download 64-bit Windows 8 Developer Preview here.
Download 32-bit Windows 8 Developer Preview here.
The System Requirements are:
1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
16 GB available hard disk space (32-bit) or 20 GB (64-bit)
DirectX 9 graphics device with WDDM 1.0 or higher driver
Taking advantage of touch input requires a screen that supports multi-touch. To run Metro style Apps, you need a screen resolution of 1024 X 768 or greater