Do you want to test the Windows 8 Consumer Preview later this month? Or you simply want to go ahead and test the Developer Preview until then?
Check this book before you do that, for complete details on how to install it, useful tips and a good overview of what is changed.
With the Windows 8 beta approaching, Bing has a special webpage dedicated to it.
If you need to know the exact version of any application you might be using, check this guide for help.
Do you want to know from where to get good looking skins like the one above? Check this roundup: