For over a year I've been coauthoring a book with someone who lives in another state, and we've tried various tools to pair-review and edit the document.
Obviously Skype has been a huge help here; it's almost better than pairing in person because everyone has a keyboard and a screen instead of switching places and leaning in and all that.
The screen-sharing software has been more problematic until now. My brother recently turned me on to CrossLoop, which is the simplest and most responsive one we've tried, and allows both users to easily type into the document. Kudos to the CrossLoop creators; this really is a big improvement.
Bruce - a HUGE thanks from a small team for this excellent support of our product! It especially means a lot when it comes from a technical expert. Please feel free to email me anytime, you or your readers have any questions. I would recommend that you subscribe to our blog for new stuff. We are working on some exciting stuff.