If you fancy a trip to the East End or down to Croydon this weekend, why not try out the new East London Line for free? Hop along to New Cross/New Cross Gate, Surrey Quays or Rotherhithe and you could pick up one of the 10,000 free tickets being given out on Sunday when the line opens for full service. Here's the relevant extract from the press release (with Boris's self-congratulatory comments deleted I'm afraid).
"Ten thousand free tickets will be given out to passengers to travel on London Overground’s new East London railway on its first day of operating a full public service this Sunday (May 23).
Free tickets will be issued at stations along the line on a first come first served basis. Each station will be given a finite number of the tickets based on the number of people who use it. Each station will be limited to one ticket per person; they will be non-transferable, valid for Sunday 23 May only and limited to the East London route on the London Overground network. Passengers interchanging from other networks need to complete their first journey by touching out with their Oystercard."
More info about the line here.