JibberJobber - Use JibberJobber to keep track of those networking contacts and keep a log of how they have helped you.

LinkedIn - Create a LinkedIn profile and start connecting. Ask and answer LinkedIn questions to increase your visibility.

VisualCV - Create a VisualCV to share with contacts and prospective employers.

Write a Blog - I know everyone, almost literally, has a blog these days. However, a well-written blog focused on your area of expertise is another good addition to your professional branding package.

Create a Presence - Comment on other people's blogs, write some articles, go to industry meetings, conventions, and events, and make contacts in your field. Be sure that all your endeavors are focused and relevant to both your skills and your career goals.

Build a Web Site - Consider a web site to create and showcase your brand. Many web hosting services have built in web building tools and it's quick and easy to build a site that reflects your professional presence.

Get Your Name Out There - Try to meet, either online or in-person, the important people in your field. Send them an email or a message via their web site or networking profile. Over the years, I've met lots of the important people in the world of job searching and careers, many of them because I sent them a quick email introducing myself or vice versa.

Volunteer - If you have time and if there's a way to volunteer in a capacity where you can use your skills and expertise, volunteering is another way to gain exposure as an expert in your career field. It's a good resume building tool, as well.