New Google Maps are awesome:
Open Google Maps and enable new maps (if you haven't yet).
Zoom out till you can.
Click on satellite view on the bottom left corner box.
You will see Earth like this:
You can see real time Earth shadow, the shadowed part of Earth is actually dark at the particular moment you are seeing.
The lights as indicated by smaller arrow are the actual glow of city street light (not real time though).
Zoom in by two mouse scrolls:
Those cloud cover are actual! And in real time!
Isn't it incredible?