Board games ordered by the number of new people on BoardGameGeek who reported playing the game in the second quarter of 2011–minus a standard penalty(*) of 500 players for any game not seen before:

1705 7 Wonders
1001 Alien Frontiers
 780 Troyes
 684 Lord of the Rings: The Card Game
 609 Forbidden Island
 598 Mansions of Madness
 598 The Resistance
 588 Dominion
 584 Dominant Species
 505 Small World
 498 Carcassonne
 495 Survive: Escape from Atlantis!
 479 Dixit
 473 Agricola
 439 Pandemic
 431 Biblios
 429 Race for the Galaxy
 428 Puerto Rico
 428 Stone Age
 415 London
 410 Settlers of Catan
 398 Sid Meier's Civilization: The Board Game
 383 Power Grid
 377 Citadels
 374 Ticket to Ride
 373 Navegador

*The penalty is mostly an artifact of my data collection method but also a fair way to measure a game’s spread beyond promiscuous consumers who try everything.