'Out, Out, Brief Quotation' - Using Shakespeare Quotes in Essays

"How to Quote Shakespeare"
"Using Shakespeare Quotes in Essays"
About.com

"You can make your essays very interesting when you add a famous quote from a famous person. And nobody better than Shakespeare to quote in an essay! But, many students feel inhibited in quoting Shakespeare. Sometimes they fear that they may end up using the quote in the wrong context. At other times, they fear...."

It's a pretty good resource for students, with headings like "Find the Right Shakespeare Quote," "Using the Quote," and "Attribution" - right up to "A Final Word of Advice." (Briefly, it's 'don't talk about the play you've quoted.')