Boom Writer is one of my favorite Web 2.0 site and is a very innovative way to integrate technology into a curriculum. This is done by having a class grades 3-8 create a digital story through an online competition in a safe environment. Students create chapters and then vote on which chapters should be included in the finished product. Once a book is completed it can then be published and a copy can be ordered. Right now BW offers a free class copy for new teachers that sign up.
Best of all there is an educational portal for Boom Writer which allows teachers to create student accounts.
I highly recommend checking out Boom Writer by clicking here!!!