I hope that you had a chance to download the Windows 8 Consumer Preview.  One of the things that you will absolutely want to do is watch Jensen’s video as a video walk-through of Windows 8 features, focusing on working with the operating system as a user, introducing the gestures and things you want to know about.  It is a great, short video and you should definitely watch it:

http://channel9.msdn.com/Blogs/Windows-Blog/Windows-8-Consumer-Preview-Demo/player?w=512&h=288

Shortcut	Action
Windows key + spacebar	Toggles between input languages and keyboard layout
Windows key + ,	Peeks at the desktop
Windows key + Enter	Starts Narrator
Windows Key + PgUp	Moves full screen window (i.e., the new Metro UI) to the monitor on the left in multi-mon situations.
Windows Key + PgDn	Moves full screen to the right
Windows Key + Shift + . Windows Key + .	Snaps application and/or moves the snapped app to left/right
Windows Key + c	Opens charms bar
Windows Key + i	Opens Settings
Windows Key + k	Opens Devices charm
Windows Key + h	Opens Share charm
Windows Key + q	Opens Search charm
Windows Key + w	Opens Settings search
Windows Key + f	Opens Files search
Windows Key + z	Toggle AppBar