I just read the "Salmon of Doubt" (which was mostly a collection of stuff published after he died) and it talks several times about this movie. It sounded like Adams was pretty excited about making it, and the forword (and other pieces of the book contributed by friends after he died) indicated that it was still going to go forward. Apparently he'd been wanting to do a movie version for a long time. I hope whoever they get to finish the script draws a lot from the previous hitchhiker stuff. I think it would be hard for anyone else to recapture the tone of Adam's writing.