I still have Mighty Joe Young on my DVR to watch, but burnt through 7th Voyage of Sinbad, The Mysterious Island and Clash of the Titans in short order.
Clash of the Titans plays fast and loose with the Greek Myths, but holds together remarkably well regardless (Calibos is a great invention!). The Medusa scene is one of the most memorably lit/filmed scenes of Harryhausen's career, in my opinion. Almost seamless and very menacing.
I just watched CLASH OF THE TITANS, too! Yeah, the Medusa scene is great. I guess in some ways HD hurts the experience of classic practical effects by showing the seams, but I had fun this time really noticing how scenes were put together. Like when Perseus was grappling with Calibos in the swamp, almost every other shot switched between actors and stop motion, and it really came across how much work was involved, and how good Harryhausen was at it.
…in some ways HD hurts the experience of classic practical effects by showing the seams…
Which were just as visible--if not more so!--in the theater.
We tend to forget how "poor" SFX were, by modern standards. Even in the original STAR WARS, I remember being hyper-aware of the different color and grain in Leia's ship as it was swallowed by Vader's. But those were things we accepted.