From the Bureau of Labor Statistics at the US Department of Labor. Describes hundreds of jobs, including:
-What They Do
-Work Environment
-How to Become One
-Pay
From the US Department of Labor's Education & Training Administration.
Includes:
-Detailed occupational skills & characteristics
-Career assessment tools
Provides information on: Professional, Technical Writing, Writing in Engineering, Medical Writing, Journalistic Writing, Writing in Nursing, etc. Check out the section on Tone in Business Writing.