http://en.wikipedia.org/wiki/Terry_Pratchett
I love his books. The ones I own are the following, I'll provide however brief a description I can from memory / wiki.
He also did a couple of movies, however the only one I've seen is The Hogfather. I beleive that it wasn't given the proper funding it should have gotten, however it did the book quite a bit of justice considering.
The Discworld series
Now this is the bomb. The diskworld is a world which is flat - yes, flat. But that's not the weird part. On this world there's natural magic, which some people (like wizards) use for magic... but that's not the weird part. The weird part is that it rides on the back of four elephants which, in turn, ride on the back of a giant turtle.
Oh, and sometimes the third elephant has to cock it's leg to allow the sun to go round.
Most of TP's books are set in this fantstic, satyrical and relativly realistic imaginary world, and some even bring up startling questions about our own reality, and what it means to the people of the Diskworld. Are we the imaginated characters, or are they? Did we as people assume the role of gods in creating them, or is it correct that (in the words of one of the famous philosiphers of the diskworld), 'Things just happen, what the hell.'?
The Fifth Elephant
This is a great little book that I stole borrowed from a library when I was slightly younger. It involves dwarves, the King of Under, Uberfeld, and Sam Vimes, the most out-of-place coppa' in a place he doesn't belong, being accused of trying to assasinate a king of something he doesn't quite understand, and if that isn't enough he's now being chased butt-naked through the snow. By warewolves.
...Intelligent warewolves.
(Sorry, those are the only two that come to mind and my eyes are getting blurry on account of the extream sweat [fucking heatwave] and tiredness. More will be added.)