There are many ways to play the ball out from the back so I thought I would try to demonstrate a few, this is part 1.
Releasing the Centre Back
I saw an example of this recently in Benfica vs Chelsea in the Champions League where John Terry, a player not exactly known for his ball playing qualities and movement in the same way as someone like Pique, Vermaelen, Kjaer or his partner on the night David Luiz.
Mikel moves between Luiz and Terry in order to get free
Terry then has the space to move forward until he is closed down and plays a pass into the feet of Kalou
This move breaks down as Kalou is pressured by Right Back Maxi Pereira into passing the ball back to Mikel but Chelsea maintain possession and Terry continues to have time and space on the left where he again receives the ball
Terry again moves forward and plays a simple pass to the feet of Kalou when pressured, who is again closed down by Pereira
This time Terry, still being covered for by Mikel,moves forward unmarked. Kalou finds Lampard who sees Terry’s run and nearly plays him in behind the Benfica defence. Benfica Centre Back Luisao is torn (as you can see by him turning to run back having been dragged up the pitch) between pressing Torres and helping Midfielder Axel Witsel who is now stuck between Terry and Cole (having tracked Cole's forward run after the Right Back Pereira has moved up the pitch pressuring Kalou). Cole, in fact, was also released by Terry’s movement to the left and Mikel coming into the centre
This short sequence shows the potential of playing out from the back if a team is patient, keeping the ball when pressed by playing a simple backwards pass, and move off the ball in a sensible manner with others filling in when players make runs from deep.