My favorite science fiction series is the [Dune] series by the late Frank Herbert. There is an official commercial site, www.dunenovels.com, associated with the recent release of books loosely about Dune not by Frank Herbert. See also:
But please note: There is a disastrously bad series of books coauthored by Frank Herbert's son. There are claims that they are working from notes found in Herbert's effects after his death, but it's pretty evident that they never bothered reading the novels he wrote, because they are not only hideously bad writing, they contain vast quantities of continuity errors.