If you live in Europe Sony giving some free frag time. From 10AM GMT on 15th November through 10AM GMT on 20th November you will get to use PlayStation Plus for free. Sony announced a new open five day event today on its EU blog.
You won’t have to do anything to take advantage of the event, just play a game that supports the service. Now you don’t get access to the Instant Game Collection, just multiplayer support without a Gold membership.