Windows 8 comes with many integrated hotkeys. Here is a list of the hotkeys currently available in Windows 8 using the Windows key.
Charms
Win + C: All charms.
Win + Q: Search charm.
Win + H: Share charm.
Win + K: Devices charm.
Win + I: Settings charm.
Search
Win + Q: Search apps.
Win + W: Search settings.
Win + F: Search files.
Metro Apps
Win + Z: Get to app options.
Win + Shift: Snap app to the right.
Desktop
Win + D: Open desktop.
Win + B: Back to desktop.
Other
Win + X: Open system utility settings menu.
Win + PrintScreen: Take screenshot and save to the folder Pictures.
Win + Tab: Open switch list.
Win + T: Preview open windows in taskbar.