Poll: What is your favourite fantasy book/series?

I've set up a poll to the right asking what your favourite fantasy book/series is. I've had a few ideas for a similar series for a while now - there are plenty of possible routes floating around, but I'm yet to decide on anything concrete.

Please feel free to say what you've chosen and why in the comments section - I'm very interested in what you believe makes a great fantasy story.

Thanks.