Grammar is the system and structure of linguistics and includes morphology, structure, and semantics.
Regular Blogs
Contains sections about grammar, punctuation, word choices, and style. It digs into where particulars came from, such as the "at" symbol, and when to use single versus double quotation marks.
http://grammar.quickanddirtytips.com/
Delves into grammar rules and points out those which are, in the blogger's opinion, bad rules and explains why.
http://motivatedgrammar.wordpress.com/
Maintained by an English major and freelance editor, this weblog is about bad spelling, inaccurate punctuation, and misplaced apostrophes.
http://thegrammarvandal.wordpress.com/
