I always think of Ray when I watch "Jason and the Argonauts".
That stop/go motion of the skeletons I found quite creepy.
http://www.bbc.co.uk/news/entertainment-arts-22441567
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One of the great pioneers of stop motion animation.
RIP Ray 
The film which sparked his interest in that type of animation was the original King Kong (1933) which was created by Willis O'Brien.
When he was still a teenager he started work on a film called Evolution, making it in his parents' shed. He never finished it as there wasn't the time and he joined the army during WW2. Only 4 minutes of Evolution was made but I found it on Youtube:
It is silent. It is influenced by King Kong and another Willis O'Brien film called The Lost World (from the book by Conan Doyle).
Some good info EL. And an interesting video.
I recall his Medusa from Clash of the Titans as being rather creepy:
Very fond memories of his work in several fantasy films.
RIP
Harryhausen was one of the great cinematic originals, and his death is a great loss.
The best tribute I can think of is that when "The Mummy Returns" was released with some dodgy special effects to turn Dwayne Johnson into the Scorpion King, Empire magazine claimed that Ray Harryhausen could have done better with a lump of Play-Doh! 