I love those books! I'm not sure what I think about a movie. I remember the really bad television show (although they did a terrific job with Marvin). So, I'll be keeping tabs on this to see how closely they are sticking to the original - especially the role of Trillian which was done so badly in the television show.
The books are so well read that they are going to have a hard time selling the movie unless they stick pretty closely to the storyline AND pick characters that have a resemblance to the descriptions. (Sorry guys this means that Trillian can NOT be a blonde bimbo in a skin tight silver suit... such is life)