Hi Yolanda,
My students have done co-writing with other classes via email and Blackboard. We have written Circle stories or Add-on stories where one class, or a team of students, would correspond with another class or a team of students elsewhere in the world. The writing topic is agreed upon by the teachers involved. One group starts and emails it to the other group who need to continue the story. It goes back and forth until the story is completed.
It makes for very interesting discussions and writing as the students have to think about where to take the story after someone else has added on to it.
I have successfully done this with one and two other classes. It is a wonderful way to get to know students from other countries and work together in a cooperative way to create a product together.
The finished story can then be published as a hard copy with hand drawn illustrations (scanned onto a Powerpoint presentation), a computer slide show in a program such as KidPix4, or as an oral/pictoral show in a program such as Photostory3. These can then be send via CD to the partner class(es) or over the net.
Good luck.
Elaine Ireland