Disney/Pixar are making a movie based on ERB's Princess of Mars called John Carter. The trailers look excellent, though they main characters are a bit overdressed
The movie release date is early this year IIRC.
There were two lamentable movies made in the 80's based on the Gor series. I have both on VHS, picked up at a video stores bargain table, many moons ago.
Love to read your opinion on Amathar, Dr Dribb.