Target audiences/perception and comprehension	Target audiences Tone Web Writing That Wows
Psychographics and “WIIFM?”	Demographics/ Psychographics WIIFM?
Media gatekeepers and their expectations	Issuing a news release
Improving writing for clarity and reader comprehension	Word Choice - (to help reduce redundancy) Word Choice - (to help reduce ‘bureaucrat speak’) Eliminating wordiness Phrasing Jargon Punctuation Proofreading "Specific Issues of Clarity in Medical/ Science Writing"
Writing as an art and a science	Writing as Art and Craft Stupid Slogans

 

Writing Style Guides: 

A really good, all-in-one style guide and reference manual: Aaron, J. E. (2001). The Little, Brown Compact Handbook (4th Edition). Boston, MA: Addision Wesley Educational Publishers. 

A compact but very worthwhile guide to phrasing and editing: Bazerman, C. & Wiener, H. S. (1979). Writing Skills Handbook. Boston, MA: Houghton Mifflin Company. 

The classic 'how to write well' books - all are more narrative than reference, but still very good reading:

Plotnik, A. (1982). The Elements of Editing. New York: MacMillan Publishing.

Shertzer, M. D. (1986). The Elements of Grammar. New York: MacMillan Publishing.

Strunk, W. & White, E. B. (1979). The Elements of Style (3rd Edition). New York: MacMillan Publishing.

Links to other resources:

Common Proofreading Symbols and Abbreviations:  http://webster.commnet.edu/writing/symbols.htm

Common Errors in English:  http://www.wsu.edu/~brians/errors/

The Elements of Style:  http://www.bartleby.com/141/

A Dictionary of Slang - http://www.peevish.co.uk/slang/introduction.htm