Being There was a very good book and an even better film. That scene when Chance leaves the mansion for the first time in his life and walks the streets of DC to the strains of Deodato's version of "Thus Spake Zarathustra" is excellent.
The Painted Bird is one of the most disturbing books I've ever read. Highly recommended. And I partially agree with Black Swan about Steps. Not as good, but not too bad.
I also own Blind Date and Passion Play, which I picked up in hard copy at a used book store on the cheap, but I've yet to read them.
And James mentioned the whole plagarism thing, which I've heard about, but I really don't know much about that.