Ubik was good, and A Maze of Death should be read purely for its ridiculousness.
(, Mon 11 May 2009, 16:52, archived)
My favourite novel of his is probably A Scanner Darkly, although many of his short stories are also excellent.
Some of his books I enjoy but find really confusing and can't really make sense of without a few rereads. The Three Stigmata of Palmer Eldritch, for example. But he's very good at putting you into the minds of his characters.
(, Mon 11 May 2009, 16:56, archived)