He had released something new, Groove. When I read what Groove did, I got interested, and I checked it out. What I found follows. Each space allows its users to chat with other users or participate in discussions similar to the forums here on rpg.net. Each space also allows any of its users to add documents or pictures to it that the other users can see and access.
Users can surf the net together or even play chess against each other.
All of this, except the chatting, surfing, and chess playing, can be done online or offline. Finally, unlike Notes, Groove does not require a central computer to control things. Once someone is invited to join, that person has as much access and control as the person who started the space. The above might not seem so special, but Groove is easily applied to campaign maintenance and game play. First, you can post campaign notes and pictures as you like.