TWS articles about technical writing

How to Be a Persuasive Writer: Know Your Audience

How to Make Your Writing Interesting and Clear

Writing Articles for the Trade Press

How to Make Your Technical and Business Writing Easy to Read

Using lists effectively in your writing

Effective Writing Strategies - a powerpoint presentation

Useful texts

The Elements of Style by William Strunk & E.B. White is a classic style guide that is well-worth reading and re-reading.

Plain Style:Techniques for Simple, Concise, Emphatic Business Writing by Richard Lauchman, published by the American Management Association, gives many examples of "good" vs. "bad" writing.

Spring into Technical Writing for Engineers and Scientists by Barry J. Rosenberg is thorough and easy to read. The book describes general writing principles and includes a section on writing specific kinds of documents like manuals, websites, and proposals.

The 10% Solution:Self-editing for the modern writer by Ken Rand has excellent tips for editing your work to make it concise.