Well, I am involved in five games at them moment (I know, lucky me).  In order of age:
Game 1: Palaestra/Wednesday Night Game
Which I am in the process of leaving as soon as the current story arc concludes.  I know most of the people involved through the MOTiVE APA (for more info visit: 
www.athens.net/~rlyeh/MOTiVE.htm) before I moved out to Athens, GA, to attend the University of Georgia.
Game 2: Champions of the 60s / Heroes Inc.  (
www.athens.net/~rlyeh/champs.htm) 
Met almost all the players though Tyche's Games, the gaming store that I work at.
Game 3: Saturday D&D Game at Tyche's Games.
This is an open game, pretty much anyone who stops by and follows the campaign characrer generation rules is welcome to join in, so we have a bit of a revolving cast.
Game 4: Monthly Game.  
Most of the people in this game are from the IT depts of UGA but I was invited by the GM as someone he could rely upon.
Game 5: Saturday Evening AD&D campaign (Drakonhold Campaign).
GMed by my wife and most of the player were recruited from the Tyche's crowd as well.
I guess I rely mostly on working in a gaming store for locating and sounding out player.  <grin>  Tyche's is located in Athens, GA, and we have a posting board for people looking for players and games . . . (
www.athens.net/~rlyeh/tychespage.htm)   And I am also lucky that my wife is a gamer.