Out of the sprawl trilogy, I'd say Mona Lisa Overdrive would probably make the better "movie". Unfortunately, Molly is difficult character to use as the common thread. Don't get me wrong, I love Molly as a character and she is perfect to connect the books, but I cannot see using her ambivalence to the world as the connective tissue between "movies". And if we're mentioning sci-fi books that should be turned into movies, Neil Stephenson's Diamond Age is high on my list.