MeetingWords is a free service for creating an online notepad and chat room. Through MeetingWords you can quickly create an online place to collaboratively create documents with one or more partners. You do not need to register in order to use the service. You can chat in real-time while creating a document. Every person contributing to the documents you build is assigned a highlight color so that you can easily track who wrote what in the document.
People who have used EtherPad (now offline) or TitanPad will notice that MeetingWords is very similar to those tools. The similarity is due to the fact that they use the same code.
Applications for Education
Google Documents is great for collaborative writing, but not everyone has Google Documents. Google Documents also requires sign-in in order to track changes. When you want to quickly collaboratively create a set of notes, MeetingWords is a good option to try.