Here's a couple of really good documents on OT:
http://www.codecommit.com/blog/java/understanding-and-applying-operational-transformation
http://fitzgeraldnick.com/weblog/41/
And libraries I had success with:
Here's a couple of really good documents on OT:
http://www.codecommit.com/blog/java/understanding-and-applying-operational-transformation
http://fitzgeraldnick.com/weblog/41/
And libraries I had success with: