I just thought of posting this Windows 8 keyboard cheatsheet here to help users who have just upgraded to Windows 8. Hope you find this helpful.
Windows Key + D Show Desktop Windows Key + C Open Charms Menu Windows Key + F Charms Menu – Search Windows Key + H Charms Menu – Share Windows Key + K Charms Menu – Devices Windows Key + I Charms Menu – Settings Windows Key + Q Search For Installed Apps Windows Key + W Search Settings Windows Key + Tab Cycle through open Modern UI Apps Windows Key + Shift + Tab Cycle through open Modern UI Apps in reverse order Windows Key + . Snaps app to the right (split screen multitasking) Windows Key + Shift + . Snaps app to the left (split screen multitasking) Windows Key + , Temporarily view desktop Alt + F4 Quit Modern UI Apps Windows Key + E Launch Windows Explorer Window Windows Key + L Lock PC and go to lock screen Windows Key + T Cycle through icons on taskbar (press Enter to launch app) Windows Key + X Show Advanced Windows Settings Menu Windows Key + E Launch Windows Explorer Window Windows Key + Page Down Moves Start screen and apps to secondary monitor on the right Windows Key + M Minimize all Windows Windows Key + Shift + M Restore all minimized Windows Windows Key + R Open Run dialog box Windows Key + Up Arrow Maximize current window Windows Key + Down Arrow Minimize current window Windows Key + Left Arrow Maximize current window to left side of the screen Windows Key + Right Arrow Maximize current window to right side of the screen Ctrl + Shift + Escape Open Task Manager Windows Key + Print Screen Takes a Print Screen and saves it to your Pictures folder Windows Key + Page Up Moves Start screen and apps to secondary monitor on the left Windows Key + Pause Break Display System Properties Shift + Delete Permanently delete files without sending it to Recycle Bin Windows Key + F1 Open Windows Help and Support Windows Key + V Cycle through notifications Windows Key + Shift + V Cycle through notifications in reverse order Windows Key + 0 to 9 Launch/show app pinned to taskbar at indicated number Windows Key + Shift + 0 to 9 Launch new instance of app pinned to taskbar at indicated number Alt + Enter Display Properties of selected item in File Explorer Alt + Up Arrow View upper level folder of current folder in File Explorer Alt + Right Arrow View next folder in File Explorer Alt + Left Arrow View previous folder in File Explorer Windows Key + P Choose secondary display modes Windows Key + U Open Ease of Access Center Alt + Print Screen Print Screen focused Window only Windows Key + Spacebar Switch input language and keyboard layout Windows Key + Shift + Spacebar Switch to previous input language and keyboard layout Windows Key + Enter Open Narrator Windows Key + + Zoom in using Magnifier Windows Key + – Zoom out using Magnifier Windows Key + Escape Exit Magnifier