The End of Mr. Y (Scarlett Thomas)
The End of Mr. Y is quite an odd book, but it is refreshing to read something new and different. (The closest thing that I have read is Goedel, Escher, Bach by Mr. Douglas Hofstadter.)
It's been reviewed already, and I am afraid that I really have nothing else to add. Check it out!
(Very short: both Billy Goat and I--independently--have rather important things swirling around offline.)