I've been here for months, and never seen this thread, I think it must have been up'd recently. I am a huge ACC fan ! I've got and read all the the 2001 books, and the 4 books in the Rama series. I can see both sides of the arguement on the 3 sequels to Rama. I read them all, and loved the development of the characters, and was sad when I completed the final book as there was no more to read The 3 sequels do differ in style and content from the original masterpiece, but I enjoyed them. I think the problem for some people with the sequels was that there was too much fiction, and not enough science. I love ACC novels as there is some in depth science, with abit of fiction to make a story. I don't think there is anything in his novels that is technically impossible. I recently picked up a copy of "Childhood's End" - I enjoyed the start to the novel, but didn't really like the latter stages of the book. If you like short stories, then get a copy of "Of time and Stars" (I think thats the title), its got aout 15 short stories, all excellent in their own way. I agree that "The Nine Billion names of God" is a great story, and I'm like to add "The Sentinal" as another. It was the inspiration for 2001. (and possibly that dull movie "Mission to Mars" from a few years back. I'm currently reading a Tom Clancy novel, but I might give "The Hammer of God" a try next.