I came across a piece over at PC gamer about a game called Man vs. Machine. This game hopes to create a world record by hosting a 1,000 player FPS battle. At 500 a side this will be a hell of battle. This will take place this Sunday at 3pm GMT. To be part of this you can take your chances at getting on the server as slots work on first come, first serves. However you can guarantee yourself a spot by buying a ticket, detail of how to do so can be found in the FAQ page
World Record - 29 Jan 2012 from MuchDifferent on Vimeo.