I stumbled across ESA’s MERIS Images RApid VIsualization (MIRAVI) page just today. “MERIS” stands for Medium Resolution Imaging Spectrometer, an instrument onboard Envisat that measures solar radiation reflected by the Earth in fifteen regions of the visible and near infrared spectrum; it images the entire surface of Earth every three days. The image above happens to have been the most recent image when I first glanced at the page: the Dominican Republic and Puerto Rico as they appeared this morning (my time).
I like the interface to the data. A map on the right had side allows you to select what part of Earth you want to explore, searching for images of whatever part of the globe you zoom in on. Images appear on the left, and when you select one, its area appears in red on the global map. Nice, simple, straightforward. I love Google Earth, don’t get me wrong, but this interface to rapidly-updated data does a good, no-frills job.