Landsat Lens is fun: search for a place and see how it changed from 1975, 1990, 2000, 2005, and 2010 using the public Landsat archive. A series of good (and well-known) examples are provided on the left.
I like the clean and simple interface, but there are two issues (none of which are the responsibility of the author). First, it's slow...it takes a long time for the Landsat scenes to load. Second, Landsat with its 15/30 m resolution since 1990 (worse in 1975) is just not cutting it anymore if you are used to seeing the awesome commercial high-res images and data from Airbus, GeoEye, DigitalGlobe, LiDAR, etc. Don't get me wrong: Landsat was (and is) great for what it was (and is) = a globally-consistent and free satellite image data set, but it is frustrating as a scientist to not have access to the commercial data (which are prohibitively expensive).
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