The big yearly Steam Summer Sale 2014 has started today, the sale will last from June 19th through June 30th. Expect discounts through out the sale each day, with even bigger discounts in daily deals and flash deals.
During the sale you will also get the chance to vote on which games you would like to see go on sale for daily deals, and you can earn special Steam trading cards for every 3 votes. You can also craft badges to from the summer adventure cards to earn special steam items and also the chance to win games off your steam wishlist. Head over to Steam to see all the games on sale each day.