The best assignments allow students to do something that impact the world. See samples.
Students consistently told us that “really good” or “the best” writing is writing that is performative, that makes something happen in the world; for more information about this aspect of our findings, please see our article “Performing Writing, Performing Literacy”
via Stanford Study of Writing
Of course, good teaching is always going to be crucial, as is the mastering of formal academic prose. But it’s also becoming clear that online media are pushing literacy into cool directions. At the same time, the proliferation of new forms of online pop-cultural exegesis—from sprawling TV-show recaps to 15,000-word videogame walkthroughs—has given them a chance to write enormously long and complex pieces of prose, often while working collaboratively with others.
via Clive Thompson on the New Literacy.