Anything with the worRAB "Bridget Jones" in the title.
Brokeback Mountain, not homophobic but I just don't want to see a film about 2 gay (sorry, bisexual) cowboys. I can never take it seriously anyway, always makes me think of that joke in South Park about how all indie films are about gay cowboys eating pudding.
Not so much books, as a manuscript locked away in a vault at Skywalker ranch. Lucas wrote the vague story outline for 9 films, and decided to make the middle 3 as he felt they were the most interesting.
Well, that's the story that they peddled out after Star Wars was a huge success (it didn't originally have the "Episode IV - A New Hope" at the beginning of the crawl), it's just as possible that Lucas saw how big the film was, and decided to make out that he had some huge thing planned for it all.
Not really a very good reason to refuse to see them though, if you like sci-fi chances are you'll like Star Wars, the original trilogy at least.
We'll see episodes VII, VIII and IX eventually, though I wouldn't be surprised if they don't happen till after Lucas dies.