I finally got around to watching the Howard Philip Lovecraft Society’s filmed version of Call of Cthulhu and I was blown away — I immediately watched it again just for good measure.
On its website for the film, the HPLHS says,
Using the “Mythoscope” process — a mix of modern and vintage techniques, the HPLHS has worked to create the most authentic and faithful screen adaptation of a Lovecraft story yet attempted.
I’d say they succeeded far beyond what I had imagined was possible with HPL’s stories. They did a stellar job of capturing the general weirdness of HPL (which is quite a compliment given that must attempts to adapt HPL are pretty much unwatchable).
The HPLHS web site notes their in pre-production on The Whisperer In Darkness. Hopefully there will be a long string of similar adaptations.