We're using ShareJS in production for the authoring side of http://theconversation.edu.au - it's brilliant and solved most of our collaborative editing pain.
If only it wasn't written in node....
If only it wasn't written in node....
For science, I ported the core operational transform algorithm code from coffeescript into C and got a ~10% reduction in code size and an 8x performance boost. The networking and database code won't translate anywhere near as well, but it may still be worth doing at some stage.