Here's their description of what they're looking for:
"These features will show how to accomplish a specific instructional goal by using nontraditional methods (usually some nifty free technology). Please see some of our past features for examples."
The deadline is Monday, May 24, at 8:00 a.m., so send your pitch soon! (You don't have to have the whole article written by then, just a description of what you're going to write. Full details are at this link.)