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As you might expect, salaries vary considerably based on location. I’ve looked over various surveys and believe the following are representative of salaries currently being offered.
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Tech Writer Salaries in the U.S.
It's hard to say how much money full time freelance technical writers make. But we do have some data on salaries made by full time technical writers working for a company.
Adar, Bryan S. Blogspot (2008). Careers>Writing>Salaries>Technical Writing
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Feast or Famine: U.S. Technical Writer Employment, 2007 
Gives an in-depth overview of the latest Bureau of Labor Statistics information regarding salary data for technical communicators.
O'Sullivan, Richard. Intercom (2008). Careers>Writing>Salaries>Technical Writing
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The WritersUA 2009 Salary Survey
A central element of any job we hold is the compensation we receive. While compensation is only one factor in our descision to accept a position, it's how many of us keep score and the way all of us pay the bills. The WritersUA Salary Survey provides you with detailed and comprehensive information about compensation for user assistance professionals. Our 2009 Salary Survey results were viewed on our web site by over 21,000 visitors. We hope you find these new survey results useful in gauging where you stand amongst your peers.
WritersUA (2009). Careers>Salaries>Technical Writing
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Technical Writer Salaries in United States
Information about average technical writer salaries in the United States.
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Occupational Employment and Wages: Technical Writers
Write technical materials, such as equipment manuals, appendices, or operating and maintenance instructions. May assist in layout work. Industries with the highest published employment and wages for this occupation are provided. For a list of all industries with employment in this occupation, see the Create Customized Tables function.
U.S. Bureau of Labor Statistics (2008). Careers>Salaries>Writing>Technical Writing
