Google and Sony Pictures are collaborating on The Da Vinci Code Quest:

Beginning on April 17th you will embark on a quest that requires skill, intellect, and perseverance. For 24 days, you will encounter unique challenges. These daily puzzles will pull you deeper into the world of The Da Vinci Code.

As Google Blogoscoped points out, the "quest" is available as a Google Personalized Homepage module. Although it sounds a little cheesy, I'm going to give it the benefit of the doubt for now and see what it's like next week...