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!)
(# = 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.