Google, in what I think may be their first promotional partnership of this kind, is hosting a puzzle challenge related to the upcoming release of The Da Vinci Code movie.
A new puzzle is released every day for 24 days (this is day 2). They say the puzzles will get progressively more challenging. Once those 24 puzzles are out, the first 10,000 people to submit answers get a 'replica' (I'm guessing cheap and plastic) of a codex from the book/movie. Those 10,000 people are finalists, and they have to solve 5 more puzzles. The winner gets a bounty of Sony goodies, and a trip to the major cities from the story: New York, Paris, Rome, and London.
I'm playing along for now; I like puzzles anyway, and a short daily puzzle never hurt anyone. I do hope they get a little tougher as time goes by, though.
If you're wondering "how they get you", it's this: to play, you have to have or establish a Google ID (free), and to play the puzzles you have to visit Google's Personalized home page. That's what's in it for Google; anyone playing will have to visit the personalized home page, possibly every day. If Google can convince new users to stick around and try the home page, that's eventually good news for them; they could someday have AdWords ads based on your home page content. Google's Personalized home page has some nice features, but I haven't made it my home page, and I've known about it for a while.
Anyway, if you are interested in the Google/Da Vinci puzzle challenge, you start here: http://www.google.com/davincicode.