Hat Tip to Brandon!
General
Win+Up
Maximize
Win+Down
Restore / Minimize
Win+Left
Snap to left
Win+Right
Snap to right
Win+Shift+Left
Jump to left monitor
Win+Shift+Right
Jump to right monitor
Win+Home
Minimize / Restore all other windows
Win+T
Focus the first taskbar entry
Pressing again will cycle through them, you can can arrow around.
Win+Shift+T cycles backwards.
Win+Space
Peek at the desktop
Win+G
Bring gadgets to the top of the Z-order
Win+P
External display options (mirror, extend desktop, etc)
Win+X
Mobility Center (same as Vista, but still handy!)
Win+#
(# = a number key)
Launches a new instance of the application in the Nth slot on the taskbar.
Example: Win+1 launches first pinned app, Win+2 launches second, etc.
Win + +
Win + –
(plus or minus key)
Zoom in or out.
Explorer
Alt+P
Show/hide Preview Pane
Taskbar modifiers
Shift + Click on icon
Open a new instance
Middle click on icon
Open a new instance
Ctrl + Shift + Click on icon
Open a new instance with Admin privileges
Shift + Right-click on icon
Show window menu (Restore / Minimize / Move / etc)
Note: Normally you can just right-click on the window thumbnail to get this menu
Shift + Right-click on grouped icon
Menu with Restore All / Minimize All / Close All, etc.
Ctrl + Click on grouped icon
Cycle between the windows (or tabs) in the group
