Commas and Semicolons

General Comma Help

• UNC on Commas (Seven Simple Rules)
• Purdue OWL on Commas (Note Several "Tabs"/Sections to the Left)
• Purdue OWL on Commas with Nonessential Elements (An Essential Note)

Comma Splices, Run Ons, Fragments, Sentence Boundaries

• A Clear Explanation of Comma Splices (Grammar Girl) 
• Knowing When to Use Commas in Compound Sentences ("WikiHow") (29b)
• Some Comma Splice Exercises (D'Youville College OWL)
  
• Graphic Guide to Semicolons (The Oatmeal) (This One is Great.)
• >>For more practice exercises, try these links (right-hand column).<<

More on Semicolons

• Some Semicolon Exercises from D'Youville College OWL
• "Semicolons: A Love Story" (Ben Dolnick at the NYT)

Also

• WikiHow's English Grammar Pages
  
• HyperGrammar (University of Ottawa OWL)
• Guide to Grammar and Writing (Charles Darling)
• Common Errors in English (Paul Brian)
• Modern English Grammar (Daniel Kies)
• The Student's Guide to Grammar and Punctuation (Chandra Clarke)
• Another Collection of Resources (Wise Old Sayings)
• 
  
• The History of English in Ten Minutes
• Blog of Unnecessary Quotes
• Apostrophe Abuse Blog
• 
  
• An Illustrated Book of Bad Arguments
• 
  
• Writing Commons, Online Textbook
• Re:Writing 3, Online Textbook