Purdue's OWL (Online Writing Lab) http://owl.english.purdue.edu/owl/resource/557/01/
MLA Citation http://www.liunet.edu/cwis/cwp/library/workshop/citmla.htm
Concise Writing http://grammar.ccc.commnet.edu/grammar/concise.htm
Transitions http://grammar.ccc.commnet.edu/grammar/transitions.htm
Punctuation Quiz http://grammar.ccc.commnet.edu/grammar/cgi-shl/quiz.pl/punct_quiz.htm
Fragments http://grammar.ccc.commnet.edu/grammar/quizzes/niu/niu6.htm
Run-Ons http://grammar.ccc.commnet.edu/grammar/quizzes/runons_quiz.htm
Morrison's Recitatif http://amb.cult.bg/american/5/morrison/recitatif.htm
Agreement http://grammar.ccc.commnet.edu/grammar/cgi-shl/quiz.pl/consistency_quiz.htm
Research Paper Example http://owl.english.purdue.edu/owl/resource/557/17/
Proofreading http://owl.english.purdue.edu/owl/resource/561/01/
Summarizing, Paraphrasing, and Quoting http://owl.english.purdue.edu/owl/resource/563/01/
Introductions, Body Paragraphs, and Conclusions for Argument Papers http://owl.english.purdue.edu/owl/resource/724/01/
Literary Analysis Presentation http://owl.english.purdue.edu/owl/resource/697/01/
More on Conciseness http://owl.english.purdue.edu/owl/resource/572/01/