I've read The Shining. It is the only one of his that I've read that I loved. The movie is good too, but the book is better. Well the Kubrick movie..I didn't see the newer version made for television. I thought I read that it stayed closer to the book.
I love Watchers. That is probably my favorite Koontz book.Phantoms is really good too. I think the one with the strangers in the hotel is Strangers. I liked that one too. I've liked more Koontz books than King books...though I haven't read many King books. I'll probably try to see the tv mini-series some time.
Letter (in French and a translated version) from Francois Truffaut arranging the famous interviews they did