Steam has historically done an exceptional job with providing semi-regular discounts; now, there's going to be a new one every single day. This could be very bad news, depending on your level of self control. Or fantastic, if you're a frugal gamer.
Kicking this feature off is Operation Flashpoint: Dragon Rising, which is down to $5 for now. Simply go to the main store page and shift your eyes toward the right of the screen to see what the current daily deal is.
Let the age of buyer's paranoia begin.