I came across this site called "Etherpad" one day. It is great for collaborative writing, and updates in real time! I've tried it out and it's really cool!
Etherpad would be very useful if you are writing or editing an article with 2 or more people. The great thing is, you don't need an account to use it.
So, why not try it out now? www.etherpad.com
What do you think of EtherPad?