The AtD rule set was inspired from many resources and projects around the web.  
The following resources were particularly helpful:

LanguageTool Open Source Language Checker
http://www.languagetool.org

PlainLanguage.gov
http://www.plainlanguage.gov

GNU Style and Diction
http://www.gnu.org/software/diction/diction.html

Wikipedia
http://en.wikipedia.org/wiki/Category:Wikipedia_style_guidelines
http://en.wikipedia.org/wiki/Wikipedia:Lists_of_common_misspellings
  (and many other lists...)

Graviax Grammar Checker
http://graviax.sourceforge.net/

Cliches: Avoid Them Like the Plague
http://suspense.net/whitefish/cliche.htm

WordNet - Lexical Database for English
http://wordnet.princeton.edu/
