The Dune novels are great, but it is disappointing that the series never properly ended. Some of the Star wars novels are worth reading, and the one Traci Harding I have read made me want to seek out the sequels...it's on my list of things to do after the HSC
The only science fiction book I've ever read was Ender's Game for english last year. It wasn't bad but I can't say I'm really into science fiction. I agree with almost everyone else, fantasy is more interesting to me.
I played the Dune computer game once, does that count?