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.
The Smithsonian Institution has a wonderful online exhibition of satellite imagery called Earth from Space. There are a variety of categories including the living planet, water and air, structure of the land, the human presence, and satellite technology.
Each category has a few images (zoomable and scrollable) with a small section of text, geographic information, and satellite information.
The website is a good resource for those wishing for a simple introduction into the world of remote sensing.