The Daily Wishlist Giveaway begins today on Steam. Each day 10 people will win the top 10 games on their wishlist. The Giveaway begins December 1st and will continue into the holiday season.
To enter, you must have a Steam account and a Wishlist with at least 10 games. Each day you will need to visit the gamepage of the featured daily deal, starting with Terraria at 75% off.
Go here for more information.