The Geography Blog focusing on all things geography: human, physical, technical, space, news, and geopolitics. Also known as Geographic Travels with Catholicgauze!
Written by a former National Geographic employee who also proudly served in Iraq and Afghanistan.
EarthTools might as well be featured on "Pimp my Google Maps" because it is that good. Earth Tools uses Google Maps as a base while providing extras like Sunrise, Sunset, Civil, Nautical, and Astronomical Twilight; local time; and Elevation data. In some countries like Ireland an extra map layer which shows contour lines are available. Just take a look at Sugarloaf Mountain.
Now if these tools could be (or if someone could show me) integrated into Google Earth or GeoPortal I would be thrilled. (Hat Tip: Spatial Ireland)