Weather geeks (we know you're out there) and lifehackers alike now have a new tool to feed their obsessions. Google has added a weather layer to Google Maps that displays current conditions from around the world, from London right down to the tiniest town in northern New Mexico, where the weather's always likely to be better than in London.
In Google Maps, hover over other the widget in the upper-right corner and you can chose the weather layer from the drop-down to make it visible. To actually see cloud cover and current weather conditions, you'll need to zoom out quite a ways, generally to at least a state-level view.
The cloud-cover and other weather visualizations come courtesy of the U.S. Naval Research Lab. Current condition information and the local forecasts that pop up when a certain locale is clicked are provided by Weather.com.
The weather layer doesn't seem to be supported just yet on the Android version (I tried on the latest--recently updated Google Maps 5.9). Here's Google's quick demo: