Since I would like to hear more about what goes on at some of the conferences I can't make I thought I would post some of what stuck out the most for me at this one. This is just what stuck out to me. If I miss something or am wrong about something I apologize in advance.
Nama Budhathoki gave a good presentation (over Skype!) on who the contributors to OSM are and why they do what they do. It had breakdowns of how much people contributed verse what their reasons for contributing were. It also had a bit on the backgrounds of OSMers such as age, gender, and traditional GIS experience.
Randal Hale and Leah Keith gave a talk about using OSM as a teaching tool with high school students. Her students seemed to really take to it. It was also very good because it doesn't cost the school any money if they already have computers. The FREE component was really important. They can just make accounts and get started. They used Mapzen because they found it to be the most user friendly. Even after the class project some of the students have continued to contribute useful data to the map.
Jon Nystrom gave a talk about ArcGIS being able to work directly with OSM files. Many attendees were excited about this because many people in attendance came from a GIS background and 'grew up on' ArcGIS. People like to use the tools they know. It will probably help more professionals contribute to OSM because they won't have to learn a new tool set.