Refactoring (Martin Fowler).
Speaking of the Matrix, eXistenZ (very strange), and the Thirteenth Floor (didn't watch it), and probably some others with a similar theme like that also came out that year.
Refactoring... wow. How many programmers have been redefined by works published that year alone?
I can't say eXistenZ was a particularly good movie in any objective way, but I enjoyed it and watched it several times.
Thirteenth Floor has been on my Netflix queue for a while... I should really get around to it.
I've heard very good things about this book, is it worth a read for a more seasoned dev?