I can't really decide, but here are a few of my favorites.
* Song of Ice and Fire series. I never really liked fantasy but this series is wonderful. The TV-series (Game of Thrones) is okay but a far cry from the books.
* The Pragmatic Programmer. The best programming book I've seen. A must read for programmers I'd say.
* Introduction to Algorithms. Haven't really gone through it but so far it's been great.
* Song of Ice and Fire series. I never really liked fantasy but this series is wonderful. The TV-series (Game of Thrones) is okay but a far cry from the books.
* The Pragmatic Programmer. The best programming book I've seen. A must read for programmers I'd say.
* Introduction to Algorithms. Haven't really gone through it but so far it's been great.