"Cyberiad" and "Mortal Engines" are also great books but much more playful and probably geared towards a younger audience, even if some of the subject matter is philosophically deep.
I think Stanislaw Lem kind of suffered from the same fate as Gibson's work in that there have been a few attempts at making them into movies but they haven't ever really took off or translated well.
I do wish his books were in the public domain, though.