Many successful freelance designers I know that get work from online inquiries are also very much into blogging.
If you want to build your business faster then I strongly recommend that you get into blogging too.
So what is blogging in a nutshell? The term blog is short for web log, a "log" of diary-like entries published on a web site.
This is how it started, people publishing their daily thoughts for all to read on their website.
Mainly the entries occur as short, quick snippets - a link to something cool found on the web, an opinion or just a rant.
Sometimes longer, thoughtful essays.
But blogging has evolved into something much bigger than that.
Some of the main authority sites for particular niches are simply blogs.
So why should freelance designer have a blog? Blogging is a very simple, fast method of getting your art online in a format that people can easily see.
An excellent example of this is an freelance illustrator called Jon Burgerman (Google him).
Jon puts a huge amount of work onto his site.
In doing this I believe he achieves the following:

• Provides a "community" feel by allowing site visitors to post feedback to his journal entries.
  
• Builds an archive of work that you can browse through to get to really understand his style and how it has developed.
  
• Able to get people to subscribe to his site.
  This means he can effectively keep in contact with 'fans'.
  
• He also has a shop built into the blog that allows fans to purchase his artwork directly through PayPal.
  

 These are just a few of the many good reasons you should be blogging.