I was intrigued by the similarities between Dreamfall and the series of books by Tad Williams called Otherland. The ancient man kept alive by technology at the top of the tower in a garden with two servants who are twins. He controls a world-wide evil corporation in charge of a project that is related to another world. And of course, at the center of it all is a child that is no longer a child and has become a monster of sorts.
I hadn't seen this brought up before, and just wanted to get it out there.
For those of you who haven't read Otherland, you should.