After what feels like a long wait for the PC community, Valve has launched their Steam Summer Sales for this year. The Sale will end on the 22nd of July.
On top of a huge discount on games across the entire catalog, there are also Daily Deals, Flash Sales and Community's Choice Sales (both of which change every 8 hours).
At time of writing, Saints Row: The Third won the community's choice and will be on sale for $5 USD from 10am GMT (12 July, 2013) till 6pm GMT today.
A tip for newcomers to a Steam Sale. Best time to buy is through the daily deals, community's choice and flash sales. It is during these sales that games are cheaper than their originally discounted price. If you do miss any of the sales and the game you wanted to buy, the last day always includes the games which sold better than the rest during the previous sales and will return.