The two threads on book titles as if they were written today are still going strong...there are some really good ones in the comments.
Then: The Bible
Now: A Million Little Signs and Wonders
Then: The Sun Also Rises
Now: Drink, Bullfight, Mope
Then: Philosophiae Naturalis Principia Mathematica
Now: Why Do Apples Fall Down and Not Up? Answers From The Cutting Edge of Physics
Then: Frankenstein, or The Modern Prometheus
Now: Frankenstein: Wrath of the Supercorpse
Then: Declaration of Independence
Now: The Pursuit of Happiness: How to get control of your continent and have fun doing it!
Then: The Oxford English Dictionary
Now: Word Up! 300,000 proven ways to express yourself in speech and writing
Then: To Kill A Mockingbird
Now: To Kill A Mockingbird (A Novel)
Then: If on a Winter's Night a Traveler
Now: A Novel: A Novel: A Novel: A Novel: A Novel: A Novel: A Novel: A Novel: A Novel: A Novel
Then: Cry, the Beloved Country
Now: Black. White.
Then: Little Women
Now: Concord 01742
Then: The Hobbit
Now: Hobbit
Then: The Art of War
Now: Call of Duty: Modern Warfare Strategy Guide
Many of the entries took old fiction titles and converted them to contemporary non-fiction titles -- e.g. Cinderella becomes How to Escape Being Bullied Without Once Standing Up for Yourself -- which wasn't really the point of the exercise but entertaining nonetheless.
Oh and if anyone wants to whip up book covers for any of these, feel free.