The Windows 8 Consumer Preview was released today at MWC (Mobile World Conference). It is available for download at http://windows.microsoft.com/en-US/windows-8/iso. If you need help with dual-booting (Installing it as your main OS is not recommended) check these links out:
If you still don’t feel comfortable after reading these, you can try running a virtual machine. Just download VMware or VirtualBox; and if you need help with those check here: http://www.howtogeek.com/105073/the-best-articles-for-learning-how-to-virtualize-operating-systems/
Here are some screenshots from the Developers Preview (I haven’t installed the Consumer Preview yet ;)).