There are several online apps that allow collaborative writing in the more traditional document-sharing fashion...

To see a few of these applications, visit what is social writing

• Google docs
• Zoho.com
• Editgrid (spreadsheets online)
• Scribd (share all sorts of documents - the home of iPaper)
• Thinkfree (share and collaborate online)

Artifacts that you can develop with these apps:

• Research papers, essays, etc.
• Online slideshows
• Databases
• Spreadsheets