Show real time updates for shared lessons
Make lessons live document like google so that when one teacher is typing, another teacher can see the changes without having to refresh the page
Heidi Freeman commented
Make planbook.com to have the ability for colleagues to collaborate on the same class/lesson at the same time. I have a student teacher and when she and I are planning together we have to click the refresh button each time to see what the other person has typed. I think it should be similar to a Google doc feature where as you type the people on your planbook can see it.