We are always looking for ways for students to work together. Google Docs are easily available and offer multiple ways of collaborating. You need to set up a gmail account and then choose the type of document you would like to work on together: documents, spreadsheets, presentations or start from a template.
Go to Adobe Buzzword at www.adobe.com/acom/buzzword/ for another efficient way to work collaboratively. This is a free account with the option to access Adobe Connect for one-to-one.