Vintage Space is a blog written by a historian of spaceflight, which has lately been focusing on the development of landing systems in the Mercury, Gemini and Apollo programs. The posts are just fascinating, including "Splashdowns: Why change a good thing?", "Landings, NASA, and the Soviet space program", and most recently, "Inventing landings".
It is impressive to read about the sheer number of naval units put at NASA's disposal for the early landings.
