Popular Mechanics has a fantastic post, Pictures of Planets & Solar System - How Images of Mercury, Venus, Mars & Neptune Have Changed in Past 30 Years. "Pick up a 30-year-old astronomy textbook and you will find more illustrations of planets than actual pictures; Pluto still holds onto its full planet status and exoplanets are theoretical. In the intervening decades, new instruments and methods have acted together to form one giant, interdisciplinary zoom lens on our planetary companions in the solar system. We now not only have hi-res images of planets, we can also predict their weather, dig for water under their surfaces and send spacecraft through icy plumes on their moons. Planet by planet, here's a quick guide to how our vision of the solar system has changed in the past 30 years."
It's only 8 short pages and has great pictures.
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