Google Earth Plugin, Real-time cloud cover viewer.
The cloud layer is a composite of live satellite images, compiled by xplanet.org, and updated every 3 hours.

• Switch between png and jpg images to choose between realism and detail.
• Use the slider control to change opacity.
• Border, toggles on place names and administrative boundaries
• Atmosphere, switches on or off Google Earth's atmospheric effect
• Time of current cloud image (GMT) displayed bottom right.

More Google Earth Plugin Applications.
Auto-updating KML file based versions of this layer for the desktop Google Earth available here.