Absolutely. I have no idea if it's true but I've read he's had more books made into movies than any other writer except for Stephen King.
To add to your list: Imposter, A Scanner Darkly, Screamer, Next and Paycheck as well as The Owl in Daylight and Radio Free Albemuth which have not yet been completed.
I will observe that I've never seen a movie from one of his books that comes close to capturing his own special brand of weirdness.
Quite true.