About errors and typos:

  » The Eggcorn Database
  » Common Errors in English
  » Grammarerrors.com
  » Funny Exam Answers
  » Typos of Doom Illustrated
  » English in the Shanghai Metro

About plain ol' bad writing:

  » Totse.com - Funny Signs and Typos
  » The Bulwer-Lytton Fiction Contest
  » The Bad Writing Contest
  » The Philosophy and Literature Bad Writing Contest
  » Turgid Prose - An Immodest Collection of Bad Writing

About writing:

  » You Write Potato, I Write Ghoughpteighbteau

  » Pageonelit.com
  » Writersstore.com
  » Writersdigest.com

  » Freelancewriting.com

  » WOW! Women On Writing

Suggested author sites:

  » Sarahjanestratford.com