Windows 8 Consumer preview is out and available for download to the public from Microsoft's web site using the link below. The site is a little bussy but keep trying. You will need to use the Windows 7 USB/DVD Download tool to convert the ISO to use on a USB drive or burn to a DVD. You can also download it as a setup file, which Windows Vista and Windows 7 users can use to pull down the OS from the Internet.
Download 64 or 32 bit versions here.