Bespoke troublemakers, the Space Hijackers, have announced that they are the Official Protesters of the London 2012 Olympic Games. To this end, they've launched a site where you can register for tickets for the official protests. They have also outlined the top ten reasons why the Olympics are worth protesting against.
A spokesperson said "accept no imitation, we are the Official Protesters. We shall be taking steps to ensure no unauthorised protest occurs around the London 2012 Olympic Games".