Writing Sites 

• Purdue University- Short overview of helpful hints etc.  Also offers guides on writing for essay exams.  Great ESL site (location on 3rd dropdown menu).
• Dave's ESL Cafe

Style Guides

• Chicago Manual of Style
• MLA
• APA Style
• CSE Number System for Science Documentation

Grammar

• Grammar and Style Guide by Jack Lynch (UPenn) 
• Strunk and White's The Elements of Style

Essay Exams 

• SUNY Geneseo - Excellent outlines with helpful first sentence tactics.  Very in-depth.
• College of St. Benedict & St. John's - Great alphabetical list of terms you could see in an essay question. What's the difference between enumerating and evaluating, criticizing and analyzing? 

Common Mistakes

• 20 Common Mistakes From Lunsford's Everyday Writer

• Oxford English Dictionary- Click on Enter OED Online. 

Preparing an Argumentative Speech

Writing Guide for History