Daylight Map shows the pattern of night and day on a Google map, for any area of the Earth, for any date and time. It also allows you to select up to ten locations on the map; in addition to seeing at a glance whether it's daytime there, you can show their local time, sunrise and and sunset times, and length of day. These locations can be remembered for future visits, saved as a bookmark, or sent to other people as a web link. This site can thus function as a graphical world clock, and can be used to show relative times of any future or past event.
It can even show just the night-time city lights, correlated to the base Google satellite view (on better browsers). Which has nothing to do with daylight per se, but is pretty cool to look at nonetheless.
There's also a near-real-time view of global cloud cover available, updated every hour from weather satellite imagery. It's interesting both for looking at the big-picture patterns, as well as a more localized picture of what the weather is doing in your part of the world. A specialized cloud-cover view is available as well, my Hurricane Watcher.
Interesting site. Try it out yourself.
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