I think this is really nicely done. I have looked at solutions like this in the past and found them really lacking in terms of what text can be selected and how the selection is indicated -- and it looks like you have gone way beyond what I remember seeing.
Last year I created a prototype to play with some ideas that are similar to this, except that I created my application using Flex. It is here http://www.annospace.com for comparison. However, my interest at the time was only in social commentary and organizing lots of comments, not in group revising/editing.
Last year I created a prototype to play with some ideas that are similar to this, except that I created my application using Flex. It is here http://www.annospace.com for comparison. However, my interest at the time was only in social commentary and organizing lots of comments, not in group revising/editing.