This site is created as a supplement for those who use Ms. Hacker's concise writing guides in their classes; in order to use some of the the site's resources, a username and password must be supplied, but much of the site itself is free for use by everyone.
About.com, a commercial site, lists here four of the most complete and best-known online writing labs (OWLS) at the present time. (Purdue University's, mentioned in this libguides HELP section, is first on their list.)
What happens when journalists fail to properly attribute their sources? Poynter.org posted this entry about that very matter in February 2012. Anyone else want to take the quiz a newspaper company sent out to test each employee's understanding of attribution?
For The Fun of It: Interactive Games and Tutorials
Test your skill at recognizing examples, forms, and types of plagiarism--and how to avoid them--without risking your assignment!