Here is a must see tutorial for those new to Windows 8
http://www.hanselman.com/blog/TheMissingWindows8InstructionalVideo.aspx
Some quick notes
Desktop is an icon
Things pinned to task bar
lower right desk switcher
Windows button toggles between desktop and start screen
scroll wheel scrolls trough the start screen
cntl + scroll zooms start screen
full screen apps from windows store
start typing on start screen searches for app to run
try hot corners
force quit full screen app mouse to top grab and drag down
window + x system controls