Sir Terry Pratchett, the author of the Diskworld novels, also has some parallel book in the same universe but for younger audiences. Look for "The Wee Free Men", "Hat full of Sky", "Wintersmith".
Favorite quote from the book: "Give a man fire and he is warm for a day. Light a man on fire and he is warm for the rest of his life."
NOTE: I just found that they made a movie out of "Going Postal". Disk can be pre-ordered from Amazon.
If you like books with some snark - check out "Sweet Silver Blues" by Glenn Cook. Mix sam-spade with tolken, beer and chesty broads - you get the idea. About 8-10 books in the series.
You might also like the Dresden novels by Jim Butcher. Start with "Storm Front" to see if you like it. If you like Audiobooks - the novels are narrated by James Marsters ('Spike' from the Buffy series).
You really might like the "Thursday Next" series by Jasper Fford about a young Literary Detective who discovers it is possible to enter the Book World and interact with the characters. Start with the "The Eyre Affair" to see if you like it. WARNING: It may cause you to read classic literature to learn the back-story of some of the characters.
Note: I just saw that Amazon has all 5 Thursday Next novels in a digital collection for the Kindle for about $60. ... must resist the boxed set.... (In the novels a "Boxed Set" is the highest honor that can be given in the Book World.)