Powerful feedback/writing process tool. Ignore the plagiarism "gotcha" aspects and use it help students understand the process of re-writing, proofreading, and citing sources correctly. Limited OSAPAC licensing in secondary. Speak to your TL.
PicLits.com is a creative writing site that matches beautiful images with carefully selected keywords in order to inspire you. The object is to put the right words in the right place and the right order to capture the essence, story, and meaning of the picture.
One of the best online whiteboarding sites that I have come across. Many great features including an etherpad, equation editor, and multiple backgrounds to write on (webpage, uploaded image, uploaded document,etc)
Create your own "fake" facebook wall. Base it on a famous character from literature, a book you are reading in class, or as a tool to illustrate good digital footprint skills.