Blizzard announced the BlizzCon Virtual Scavenger Hunt contest where you can win merchandise from Blizzard's computer and peripheral partners. Players can participate once per day. You can only miss one answer. There are at least 12 questions that you must answer and five hidden pieces per question for a total of 60 collectibles. Depending on some criteria you could win some nice loot to take home. Follow the links to participate. It's fun, but there are a few tough puzzles.