Not like I'm an expert on this matter. But here's a few tips I hope you will find useful.
Get the world to know you
No matter how good you are, customers are not going to knock on your door (until you build a strong reputation, that is), so a little bit of PR and networking will be really useful.
Social Networks (LinkedIn, twitter, Facebook) provide good opportunities. Don't be shy, don't be part of the silent majority. Let yourself be heard, although make sure to observe netiquette. Here's a good starting to explore social networking.
Professional associations can also give a boost to your career. I personally recommend ATA.
Finally, get your own spot in the Web. Ideally a web site, but a blog sharing your experiences can also be useful. I recommend Wordpress
