1 - Meet people for real (shows, parties, etc...). They are much more likely to join if they've met you and know you're not hiding, are cool, etc...
2 - If you can get a respected GFYer to join and he likes it, that will be a big plus for getting word out to other GFYers
3 - Advertise as much as your budget allows
4 - Give it time. As people begin to recognize you, they're more likely to check you out than if no one ever heard of you
* If all else fails, use KRL's suggestion
