It sounds cliche but network. I don't do anything I'd consider actively networking, but I've had more freelance work than I can do come my way over the last year and I haven't tried to get any of it. (I don't actually like freelancing much, I prefer working on my own products but it pays well so I take some of it)

Anyway, just let people you meet know what you do. I've gotten jobs from friends, my wife's boss, people I've only met in forums online etc. just because I'm the guy they know that does X, in my case mobile apps.