Ok...
Mine will probably be a list of the ones I enjoyed, as I tend to forget the ones I didn't!
Frankenstein, Book One - this is the latest of his that I've read, and it is enjoyable.. it takes the Frankenstein story a step further. In fact, I'm looking forward to Book two.
The Taking - Fascinating book, with an end that I wasn't quite expecting! As with alot of books like this, you have such a build up, that the ending is always a slight 'let-down' Still a good book.
False Memory - this was a good thriller.
Demon Seed - a quick, easy read. Highly enjoyable though.
The rest I remember reading, and enjoying, but couldn't tell you much about them. To me, that's typical of Koontz.. most books are enjoyable enough at the time, but nothing too outstanding.
The Eyes of Darkness
From the Cornor of His Eye - This one was unusual, but good.
The Servants of Twilight
Tick Tock
The Sole Survivor