Now here's a thing. I just read K-PAX II: On a Beam of Light, and on the last page it say that there's to be another book. And indeed, K-PAX III is out 3 July 2002. Can't wait.

K-PAX is the story of prot, a maybe alien from a utopian world, and the man whose body he lives inside. And there's a movie site, with a trailer, too.