Its the greatest sci-fi/fantasy/comedy series ever written. Its all very deep and meaningful, and side splittingly funny. And just to make you all jealous,
I've spoken to Terry Pratchett
I only have one thing to add to the suggestions already here: any Calvin and Hobbes Annual (the one I have is "It's a Magical World"). It's got the comedy interludes, but more than Discworld it's a nice reminder of the real world.
For me...
Any Complete Works of Shakespeare
A dictionary (might as well use my time wisely...)
A Bible (in English)
-Rob
Why dont you take my book fly somewhere and buy al the books in the world