Anyone know of any?
I know Final Draft has something like it, but I'm not sure if it real time?
Real Time Collaboration software?
It's sorta real time one person takes control other watches then control is switched.
I dunno of any sorry dude
Oh, well that's pretty much all you can ask for, Cheers Gav!
There is some magic software that allows you and your collaborators to write simultaneously and it sucks you off at the same time! You may get more writing done with the normal non-magic kind though! 
Link?