Definitely the sites with strong online FPS gaming community around them.
www.esreality.com (i have been doing some spam there myself =)
www.ggl.com
www.gotfrag.com
www.sogamed.com
www.cyberfight.org
Not sure if you know this but recently, tons of Quake3/Unreal Tournament/Counter Strike clans fell apart due to the increasing popularity of W*W. If you can get the message that
EU = Q3/UT/CS + W*W through, you will hit the 1 mil within a year. Best way of doing this would probably be talking one of the worlds biggest multigaming teams (see
www.g7teams.com) into starting an
EU division, however, this would require increased concentration on the competitive aspects of the game like providing areas dedicated to 1v1 fight (lol @ hexagons).