I've read the trilogy of books a couple of times now and after seeing the movie can say that I enjoyed it, but I don't think it was as good as it could have been. I think you summed it up with "Douglas' humor works best in print."

My main question/fear at this point is, will the movie do good enough in the general public for Restaraunt at the End of the Universe and the rest to come out? I wonder how far along they are on sequels.