To get started an impressive number of video tutorials is available in the official site of the conference: http://www.buildwindows.com/.
Check out also this great post by Michael for downloading all the Build videos in your pc.
Useful resources are available in the SDK: all the XAML Metro style app samples are available following this link.
It’s possible to install Windows 8 side by side with your operating system using a boot from VHD: I’ve followed the instructions described here by Mister Goodcat and all went smoothly.
Also available for download:
For those like me (also) interested in WPF, a list of the new features is available here.
I’m pretty excited about all these news and I’m looking forward to all the great applications that will be built using XAML, Windows 8, Silverlight, WPF and Windows Phone!