As predicted earlier , The Steam Summer Sale is now. From today until July 22nd, daily deals and flash sales will flood the Steam store with prices that are lower than the usual prices. To get the best deals, you may want to be patient and gamble on there being heavier discounts as the sale goes on—a good way to pass the time is to chart prices across a giant blackboard, mixing in the Fibonacci sequence now and then and muttering about "Gabentropy."
Currently, you can get BioShock Infinite for $30/£17.50, Counter-Strike: GO for $5.09/£4.07, Hotline Miami for $2.49/£1.74, and tons of other crazy dumb deals. You can also vote on the Community's Choice sale every eight hours—the currently leading game is something called "Heavy Load."