I met with a lot of people from both academic institutions and informal science organizations. Besides the growing movement of creating national or institutional broader impacts offices, it seems like formal evaluation of broader impact activities will be more important. One resource I learned about and am excited to explore more in depth is the "Informal Commons" created and managed by the Center for Advancement of Informal Science Education. Their database contains a lot of information about different educational programs as well as formal evaluations.
Check out the Storify version created by Geoff Hunt.